Models of Four-hole Alloy Extended Four-edge Drill Bits

1. Bosch Professional

Model: Bosch HB4000 Extended Four-Edge Alloy Drill Bit

• Diameter range: 3mm to 16mm
• Overall length: 150mm to 300mm (extended length options for deep drilling)
• Shank type: Hexagonal shank with four cooling holes for enhanced heat dissipation and chip removal
• Material: High-grade carbide alloy tip with a hardened steel body for wear resistance and longevity
• Coating: Titanium Nitride (TiN) coating, which reduces friction, prevents chip welding, and increases tool life by up to 30% compared to uncoated bits
• Flute design: Four spiral flutes with optimized helix angle (30 degrees) for efficient chip evacuation, reducing clogging and improving drilling speed
• Compatibility: Suitable for use with corded and cordless drills, impact drills, and drill presses

• The four cooling holes in the shank allow air and coolant to flow directly to the cutting zone, preventing overheating during prolonged use—critical for drilling in dense materials like hardwood or thick metal.
• The hexagonal shank ensures a secure grip in drill chucks, minimizing slippage and maximizing torque transfer, which is essential for high-torque drilling applications.
• The precision-ground carbide tip maintains sharpness even after repeated use, reducing the need for frequent sharpening and lowering maintenance costs.
• Ideal for professional woodworkers, carpenters, and metal fabricators needing reliable performance in both routine and heavy-duty drilling tasks.

Model: Bosch X-Line 4H Extended Drill Bit

• Diameter range: 5mm to 20mm
• Overall length: 200mm to 400mm (extra-long options for deep-hole drilling in thick workpieces)
• Shank type: SDS-plus shank with four precision-drilled holes for compatibility with SDS systems, ensuring quick bit changes and secure retention
• Material: Ultra-hard tungsten carbide alloy tip (WC-Co grade with 94% tungsten carbide content) for superior abrasion resistance
• Coating: Titanium Aluminum Nitride (TiAlN) coating, which withstands higher temperatures (up to 800°C) than TiN, making it suitable for high-speed drilling in heat-generating materials
• Flute design: Four parabolic flutes with a variable helix angle (25° to 40°) that adapts to different materials—steeper angles for fast chip removal in wood, shallower angles for stability in metals
• Compatibility: Designed for use with SDS-plus rotary hammers and drills, common in construction and industrial settings

• The SDS-plus shank with four holes ensures compatibility with Bosch’s Quick-Change system, allowing users to switch bits in seconds without tools, improving workflow efficiency.
• The ultra-hard carbide tip is engineered to resist chipping and wear when drilling through materials with embedded particles, such as composite boards with fiberglass reinforcement.
• The TiAlN coating provides excellent oxidation resistance, making the bit suitable for use in humid or corrosive environments.
• Recommended for industrial applications, including manufacturing, construction site drilling, and heavy-duty metalworking.

2. DeWalt

Model: DeWalt DW5800 Series Extended Four-Edge Drill Bit

• Diameter range: 4mm to 18mm
• Overall length: 160mm to 350mm (extended lengths for deep drilling in thick materials)
• Shank type: 1/4-inch hex shank with four integrated chip evacuation holes, compatible with most drill chucks and impact drivers
• Material: Heavy-duty carbide alloy tip bonded to a high-speed steel (HSS) body, combining the hardness of carbide with the toughness of HSS to resist breakage
• Coating: Black Oxide coating, which provides corrosion resistance and reduces friction, while also acting as a lubricant to prevent chip buildup
• Flute design: Four straight flutes with a polished finish for smooth chip flow, minimizing heat buildup and ensuring faster drilling
• Compatibility: Works with DeWalt cordless drills (20V MAX, 18V), corded drills, and impact drivers, as well as tools from other brands

• The four chip evacuation holes in the shank work in conjunction with the flutes to channel debris away from the cutting zone, reducing the risk of jamming and improving drilling efficiency—especially useful when drilling deep holes in wood or plastic.
• The hex shank is designed to prevent slipping in the drill chuck, even under high torque, which is critical for drilling through dense materials like oak or thick aluminum.
• The carbide tip is precision-sharpened to ensure clean, burr-free holes in metal, eliminating the need for secondary deburring operations.
• Suitable for professional contractors, electricians, and plumbers who need a reliable drill bit for installing fixtures, running conduit, or drilling through structural materials.

Model: DeWalt Extreme 4X Extended Drill Bit

• Diameter range: 6mm to 25mm
• Overall length: 250mm to 500mm (extra-long lengths for deep-hole drilling in industrial machinery or structural steel)
• Shank type: 3/8-inch round shank with four precision-machined cooling holes, compatible with drill presses and heavy-duty drills
• Material: Premium micrograin carbide tip (grain size <1μm) for exceptional hardness and edge retention, paired with a chrome-vanadium steel body for strength
• Coating: Titanium Carbonitride (TiCN) coating, which offers higher hardness than TiN and better oxidation resistance, extending tool life in high-heat applications
• Flute design: Four spiral flutes with a high helix angle (45 degrees) for aggressive chip removal, ideal for high-speed drilling in metals
• Compatibility: Designed for use with industrial drill presses, large corded drills, and magnetic drilling machines in manufacturing and metal fabrication settings

• The micrograin carbide tip provides superior wear resistance, allowing the bit to maintain sharpness even after drilling hundreds of holes in hardened steel (up to 45 HRC), reducing downtime for bit replacement.
• The four cooling holes in the shank circulate air and coolant around the cutting zone, preventing overheating and extending tip life during prolonged drilling sessions.
• The chrome-vanadium steel body is heat-treated for toughness, reducing the risk of bending or breaking when drilling through thick or uneven materials.
• The high helix angle flutes ensure fast chip evacuation, which is essential for preventing chip recutting and maintaining drilling accuracy in metals—critical for precision engineering applications.

3. Makita

Model: Makita B-65500 Four-Edge Extended Drill Bit

• Diameter range: 3mm to 12mm
• Overall length: 100mm to 250mm (extended lengths for deep drilling in furniture, cabinets, and light metal fabrication)
• Shank type: Round shank with four small holes for improved grip and chip removal, compatible with standard drill chucks
• Material: Tungsten carbide tip with a high-carbon steel body, offering a good balance of hardness and toughness for everyday use
• Coating: Zinc plating for corrosion resistance, protecting the bit from rust when stored in damp environments
• Flute design: Four spiral flutes with a moderate helix angle (35 degrees) for efficient chip evacuation in wood and plastic
• Compatibility: Works with Makita cordless drills (18V LXT), corded drills, and most other brands of drills and drill presses

• The four-edge design ensures smooth, burr-free holes in non-ferrous metals like aluminum, reducing the need for post-drilling cleaning.
• The zinc-plated body resists corrosion, making the bit durable even with frequent use in outdoor or humid job sites.
• The round shank with four small holes provides a secure fit in drill chucks, minimizing slippage and ensuring consistent torque transfer during drilling.
• Ideal for woodworkers building cabinets, furniture makers, and DIY enthusiasts working on home improvement projects.

Model: Makita D-47993 Industrial-Grade Extended Drill Bit

• Diameter range: 8mm to 20mm
• Overall length: 200mm to 450mm (extra-long lengths for deep-hole drilling in structural steel, thick timber, and industrial equipment)
• Shank type: Hexagonal shank with four large cooling holes, compatible with impact drills and heavy-duty drill presses
• Material: Premium carbide alloy tip (with cobalt addition for increased hardness) fused to an alloy steel body for maximum strength and wear resistance
• Coating: Titanium Aluminum Nitride (TiAlN) coating, which provides high-temperature resistance and reduces friction, extending tool life in high-speed drilling
• Flute design: Four large spiral flutes with a variable helix angle (30° to 50°) that adapts to material density, ensuring efficient chip removal in both soft and hard materials
• Compatibility: Designed for use with Makita’s industrial drills, impact drivers, and magnetic drill presses, as well as other professional-grade tools

• The cobalt-enhanced carbide tip offers superior hardness, allowing the bit to drill through high-strength metals like stainless steel (up to 304 grade) and hardened alloys without losing sharpness.
• The four large cooling holes in the hexagonal shank facilitate rapid heat dissipation, preventing the tip from overheating and extending its life during prolonged drilling in thick materials.
• The variable helix angle flutes ensure optimal chip evacuation regardless of the material—steeper angles for fast removal in softwoods and plastics, shallower angles for stability in metals.
• The hexagonal shank provides a secure grip in impact drills, making it suitable for use in construction sites where vibration and high torque are common.

4. Milwaukee Tool

Model: Milwaukee 48-89-2330 Four-Edge Extended Drill Bit

• Diameter range: 5mm to 16mm
• Overall length: 150mm to 300mm (extended lengths for deep drilling in walls, floors, and structural materials)
• Shank type: 1/4-inch hex shank with four integrated debris channels, compatible with Milwaukee M18 cordless drills and impact drivers
• Material: Carbide-tipped design with a hardened steel body, offering resistance to wear and breakage in tough materials
• Coating: Red Helix coating, which reduces friction and heat buildup, while also providing a visual indicator of wear for timely replacement
• Flute design: Four aggressive spiral flutes with a high helix angle (40 degrees) for fast chip removal, reducing clogging in concrete and wood
• Compatibility: Works with Milwaukee’s M18 Fuel drills, as well as other brands of cordless and corded drills with hex chuck adapters

• The four debris channels in the hex shank work with the flutes to expel chips and dust quickly, making it effective for drilling in concrete with light aggregate (e.g., cinder blocks) where debris buildup is common.
• The Red Helix coating not only enhances performance but also allows users to easily identify when the bit is worn, ensuring consistent results and preventing damage to workpieces.
• The carbide tip is reinforced for impact resistance, making it suitable for use with impact drills—ideal for contractors who need to drill through tough materials like nail-embedded wood or metal studs.
• Suitable for electricians, plumbers, and construction workers who require a single drill bit for multiple materials on job sites.

Model: Milwaukee Thunderbolt Extended Drill Bit

• Diameter range: 6mm to 25mm
• Overall length: 250mm to 500mm (extra-long lengths for drilling in thick industrial machinery, pipelines, and structural steel)
• Shank type: 3/8-inch round shank with four precision-drilled cooling holes, compatible with heavy-duty drill presses and magnetic drills
• Material: High-grade micrograin carbide tip with a cobalt steel body (8% cobalt content) for superior hardness and toughness in high-stress applications
• Coating: Titanium Nitride (TiN) coating with a polished finish, reducing friction and improving chip flow, while also resisting wear in abrasive materials
• Flute design: Four deep spiral flutes with a low helix angle (25 degrees) for stability and controlled chip removal in hard metals
• Compatibility: Designed for use with Milwaukee’s industrial drill presses, large corded drills, and magnetic drilling systems in manufacturing and metal fabrication

• The 8% cobalt steel body provides exceptional toughness, reducing the risk of breakage when drilling through hard, uneven surfaces or when encountering unexpected obstacles like welds in steel.
• The micrograin carbide tip maintains sharpness even after repeated drilling in high-strength metals, ensuring consistent hole quality and reducing the need for frequent sharpening or replacement.
• The four cooling holes in the shank circulate coolant directly to the cutting zone, which is critical for preventing thermal damage to both the bit and the workpiece when drilling in heat-sensitive metals like stainless steel.
• The low helix angle flutes provide stability during slow, high-torque drilling in hard metals, ensuring accurate hole placement and reducing the risk of bit wander.

5. Irwin Tools

Model: Irwin 3018004 Four-Edge Extended Drill Bit

• Diameter range: 3mm to 10mm
• Overall length: 100mm to 200mm (extended lengths for drilling in furniture, drywall, and light metal)
• Shank type: Round shank with four small holes for improved grip, compatible with standard drill chucks
• Material: Carbide-tipped with a high-carbon steel body, offering a balance of performance and affordability
• Coating: Black oxide coating for corrosion resistance and reduced friction
• Flute design: Four spiral flutes with a moderate helix angle (35 degrees) for efficient chip removal in wood and plastic
• Compatibility: Works with most corded and cordless drills, including Irwin’s own line of power tools

• The four-edge design ensures clean holes in wood with minimal splintering, making it suitable for finish carpentry and furniture assembly.
• The black oxide coating resists rust and corrosion, extending the bit’s life even with occasional use in damp environments.
• The round shank with four small holes provides a secure fit in standard drill chucks, reducing slippage and ensuring consistent performance.
• An affordable option for DIY enthusiasts, homeowners, and occasional users who need reliable performance without the premium price tag.

Model: Irwin Turbo Max Extended Drill Bit

• Diameter range: 4mm to 18mm
• Overall length: 150mm to 350mm (extended lengths for deep drilling in thick workpieces)
• Shank type: Hexagonal shank with four large chip evacuation holes, compatible with impact drills and drill presses
• Material: Premium carbide alloy tip with a heat-treated steel body for enhanced durability and wear resistance
• Coating: Titanium Nitride (TiN) coating, which reduces friction and heat buildup, allowing for faster drilling speeds
• Flute design: Four high-speed spiral flutes with a variable helix angle (30° to 45°) for aggressive chip removal, minimizing clogging and improving drilling efficiency
• Compatibility: Suitable for use with Irwin’s cordless drills, impact drivers, and other professional-grade tools from leading brands

• The variable helix angle flutes adapt to different materials, ensuring fast chip removal in softwoods and stable drilling in metals, reducing overall drilling time.
• The hexagonal shank with four chip evacuation holes ensures a secure grip in impact drills, allowing users to apply high torque without slippage—ideal for drilling through dense materials like oak or thick aluminum.
• The premium carbide tip maintains sharpness through repeated use, reducing downtime for bit changes and lowering long-term costs.
• The TiN coating not only extends tool life but also makes the bit easier to clean, as chips and debris are less likely to stick to the surface.

6. Freud Tools

Model: Freud FB-004 Four-Edge Extended Drill Bit

• Diameter range: 3mm to 12mm
• Overall length: 120mm to 250mm (extended lengths for drilling in thick timber and furniture components)
• Shank type: Round shank with four micro-holes for improved chip flow, compatible with precision drill presses and woodworking drills
• Material: Ultra-fine micrograin carbide tip (grain size 0.8μm) for exceptional sharpness and edge retention in wood
• Coating: Diamond-like Carbon (DLC) coating, which reduces friction and prevents resin buildup, common when drilling in pine or other resinous woods
• Flute design: Four spiral flutes with a low helix angle (25 degrees) for smooth, controlled chip removal, minimizing splintering in wood
• Compatibility: Works with Freud’s woodworking drills and drill presses, as well as other precision drilling tools

• The ultra-fine micrograin carbide tip ensures razor-sharp cutting edges, producing clean, burr-free holes in hardwoods like maple and cherry—critical for visible woodworking projects where aesthetics matter.
• The DLC coating resists resin and pitch buildup, keeping the flutes clean and maintaining drilling efficiency when working with resinous woods like pine or fir.
• The low helix angle flutes reduce splintering on the exit side of the hole, eliminating the need for sanding or touch-up work after drilling.
• Ideal for fine woodworkers, cabinet makers, and furniture craftsmen who demand precision and high-quality results in their projects.

Model: Freud METALMASTER Extended Drill Bit

• Diameter range: 5mm to 20mm
• Overall length: 180mm to 400mm (extended lengths for deep-hole drilling in metal pipes, plates, and industrial components)
• Shank type: Hexagonal shank with four cooling holes, compatible with metalworking drill presses and heavy-duty drills
• Material: Premium tungsten carbide tip with a cobalt steel body (6% cobalt) for high hardness and resistance to heat and wear
• Coating: Titanium Aluminum Nitride (TiAlN) coating, which withstands high temperatures and reduces friction, extending tool life in metal drilling
• Flute design: Four spiral flutes with a high helix angle (40 degrees) for efficient chip evacuation, preventing chip recutting and reducing heat buildup
• Compatibility: Designed for use with Freud’s metalworking tools and other industrial drill presses and magnetic drilling systems

• The 6% cobalt steel body provides excellent toughness, allowing the bit to withstand the high torque and vibration associated with metal drilling, reducing the risk of breakage.
• The TiAlN coating offers superior heat resistance, making the bit suitable for high-speed drilling in metals where friction generates significant heat, preventing tip degradation.
• The four cooling holes in the shank circulate coolant to the cutting zone, further reducing heat buildup and extending the life of the carbide tip during prolonged use.
• The high helix angle flutes ensure fast chip removal, which is essential for maintaining drilling accuracy in metals—preventing chips from clogging the hole and causing dimensional errors.

Conclusion