Garden auger drill bits are essential tools for any gardening, landscaping, or outdoor construction project, designed to simplify the process of digging holes in soil, sand, clay, or even light gravel. Whether you’re planting trees, shrubs, or flowers, installing fence posts, setting up deck supports, or creating holes for fertilization, these tools save time and effort compared to manual digging. Bunnings, a leading home improvement and hardware retailer in Australia and New Zealand, offers a wide range of garden auger drill bits from trusted brands, catering to both DIY enthusiasts and professional users. Below is a comprehensive overview of the key brands, models, and their detailed specifications available at Bunnings, covering design features, material quality, compatibility, and ideal applications.

Ryobi is a well-known brand in the DIY and home improvement space, celebrated for its reliable, affordable tools designed for everyday use. Bunnings stocks several Ryobi garden auger drill bits, each tailored to specific gardening tasks, with a focus on compatibility with Ryobi’s 18V ONE+ battery system, a popular choice among homeowners for its versatility.

This 3-piece set is a top seller at Bunnings, ideal for users who need flexibility across different hole sizes. The set includes three auger bits with diameters of 80mm, 100mm, and 150mm, each paired with a 600mm length—long enough to dig deep holes for medium to large plants or fence posts without requiring multiple passes. Constructed from high-carbon steel, the bits are heat-treated for enhanced durability, ensuring they can withstand repeated use in various soil types, including light clay and sandy loam. The spiral design features sharp, continuous flighting that efficiently removes soil from the hole as you drill, reducing resistance and making the process smoother. The bits are compatible with all Ryobi 18V ONE+ drills and impact drivers, as well as most other brands’ 18V cordless drills with a chuck size of 13mm or larger. A key feature is the hexagonal shank, which prevents slipping in the drill chuck, even under high torque—critical for avoiding accidents and ensuring consistent performance. The set comes with a convenient storage case, keeping the bits organized and protected when not in use. This model is particularly popular among home gardeners planting shrubs, small trees, or installing lightweight fence posts, offering excellent value for money.

For users who don’t need a full set, Bunnings offers this single 100mm diameter, 450mm length auger bit from Ryobi. Like the set version, it’s made from high-carbon steel with a heat-treated cutting edge, ensuring sharpness and longevity. The 450mm length is shorter than the set’s 600mm bits, making it more maneuverable for shallow to medium-depth holes, such as those needed for planting flowers, small bushes, or installing short stakes. The spiral flighting is designed with a 30-degree angle, optimized for efficient soil removal in loamy or sandy soils—common in many residential gardens. The hexagonal shank fits securely into standard drill chucks, and it works seamlessly with Ryobi’s 18V ONE+ drills, as well as other 12V to 20V cordless drills. This model is a budget-friendly option for occasional use, perfect for DIYers who tackle gardening projects seasonally. It also features a rust-resistant coating, protecting the bit from moisture and extending its lifespan when stored in garages or sheds.

Ozito is another popular brand at Bunnings, known for its affordable, entry-level tools that balance performance and cost, making them ideal for casual gardeners and homeowners new to power tools. Ozito’s garden auger bits are designed to work with both corded and cordless drills, with a focus on ease of use.

Part of Ozito’s PXC (Power X Change) system, this auger bit is compatible with all Ozito 18V PXC batteries, allowing users to share power sources across multiple tools. The bit measures 80mm in diameter and 450mm in length, a versatile size for planting most flowers, herbs, and small shrubs. Constructed from carbon steel, it features a sharp, pointed tip that helps penetrate the soil quickly, reducing the need for excessive force. The spiral flighting is spaced to allow soil to escape easily, preventing clogging— a common issue in heavy clay soils. The shank is a standard round design with a 10mm diameter, fitting most drill chucks without the need for adapters. A unique feature of this model is the ergonomic design of the flighting, which minimizes vibration during use, reducing user fatigue during extended projects. It also includes a protective sleeve that covers the sharp cutting edge when not in use, enhancing safety during storage. This bit is priced competitively, making it a great choice for first-time users or those with small gardens who need a reliable tool for occasional use.

For larger projects, Bunnings offers Ozito’s 150mm diameter, 600mm length auger bit, designed for digging deeper, wider holes. This model is constructed from hardened carbon steel, making it more durable than the 80mm version, capable of handling tougher soils, including compacted clay and light gravel. The spiral flighting is thicker, with reinforced edges to resist bending or warping under high torque. The pointed tip is self-centering, ensuring accurate hole placement—important for tasks like installing fence posts or deck supports where precision matters. The shank is hexagonal, providing a secure grip in the drill chuck to prevent slippage, even when drilling through dense soil. While it works with most 18V to 24V cordless drills, Ozito recommends pairing it with a high-torque drill (minimum 500 in-lbs) for optimal performance. This bit is popular among homeowners tackling medium-scale landscaping projects, such as planting mature trees or building garden fences, offering heavy-duty performance at a mid-range price point.

Milwaukee Tool is a brand synonymous with professional-grade durability and performance, catering to tradespeople and serious DIYers who demand tools that can withstand rigorous, daily use. Bunnings carries a selection of Milwaukee garden auger bits, designed for heavy-duty applications in tough soil conditions.

While Milwaukee is known for larger tools, this 12-inch (305mm) long, 3/4-inch (19mm) diameter auger bit is a versatile option for precision digging in gardens. Despite its smaller size, it’s built to Milwaukee’s professional standards, featuring a solid carbide tip that retains sharpness even after repeated use in rocky or compacted soil. The body is made from high-speed steel (HSS), heat-treated for maximum hardness and resistance to wear. The spiral design is optimized with a 135-degree split point, which reduces walking (drifting off-center) and allows for faster penetration into the soil. The flutes are deep and wide, ensuring efficient chip (soil) removal to prevent jamming. The shank is a 1/4-inch hex, compatible with Milwaukee’s M12 and M18 cordless drills, as well as other brands’ impact drivers and drills with hex chucks. This model is ideal for tasks requiring small, precise holes, such as planting bulbs, installing small stakes, or creating holes for garden lights. Its compact size makes it easy to maneuver in tight spaces, like between existing plants or in raised garden beds.

For larger professional projects, Bunnings stocks this 24-inch (610mm) long, 2-inch (51mm) diameter auger bit from Milwaukee. Designed for heavy-duty use, it’s constructed with a dual-alloy steel body that combines toughness with flexibility, reducing the risk of breakage when drilling through roots or small rocks. The tip is made from a proprietary Milwaukee carbide blend, engineered for extreme durability and long-lasting sharpness in the harshest soil conditions, including clay, gravel, and compacted earth. The spiral flighting features a variable pitch design—closer together at the tip for fast initial penetration and wider spaced towards the shank for efficient soil evacuation. This design minimizes friction and heat buildup, keeping the bit cool even during extended use. The shank is a 3/8-inch hex, compatible with high-torque drills and auger drivers, including Milwaukee’s M18 Fuel series, which delivers the power needed for deep, large-diameter holes. This bit is a favorite among landscapers, fence installers, and professional gardeners who need to dig holes for large trees, heavy-duty fence posts, or deck footings. Its length allows for deep holes without the need to stop and clear soil repeatedly, saving time on big jobs.

DeWalt is a globally recognized brand trusted by professionals for its innovative, rugged tools. Bunnings offers several DeWalt garden auger bits, designed to deliver high performance in both residential and commercial settings, with a focus on precision and durability.

This compact auger bit from DeWalt measures 1/2-inch (13mm) in diameter and 6 inches (152mm) in length, making it perfect for small-scale gardening tasks. Constructed from high-carbon steel with a black oxide coating, it offers excellent rust resistance and reduced friction during drilling, which extends the bit’s life and improves efficiency. The tip features a self-feeding design with a sharp point that centers the bit quickly, preventing wandering and ensuring straight holes—ideal for planting seeds, bulbs, or small seedlings. The spiral flutes are designed with a narrow pitch, which efficiently removes fine soil particles, making it suitable for use in sandy or loamy soils. The shank is a 1/4-inch hex, compatible with DeWalt’s 20V MAX cordless drills and impact drivers, as well as most other brands’ 12V to 20V tools. This model is lightweight and easy to control, making it a great choice for DIYers or gardeners with limited strength, as it requires less torque to operate than larger bits. It’s also affordably priced, making it accessible for occasional use.

For more demanding projects, Bunnings carries the DeWalt DWA1614, a 14-inch (356mm) long, 1-1/2-inch (38mm) diameter auger bit designed for medium to large holes. Built with DeWalt’s patented Speed Tip® technology, the tip features a reinforced cutting edge that penetrates soil faster than standard bits, reducing drilling time. The body is made from heat-treated alloy steel, providing superior strength and resistance to bending, even when encountering roots or rocks. The spiral flutes are extra-wide, with a polished surface that allows soil to slide out easily, minimizing clogging in heavy or wet clay soils—a common challenge in many Australian gardens. The shank is a 3/8-inch hex, designed to fit securely in high-torque drills, including DeWalt’s 20V MAX XR series, which delivers the power needed for deep drilling. This bit also includes a groove in the shank that locks into compatible drills, preventing slippage under load. It’s ideal for tasks like planting shrubs, installing fence posts, or creating holes for garden edging, offering a balance of size, durability, and efficiency that appeals to both professionals and serious DIYers.

Sidchrome is a heritage Australian brand known for its quality hand and power tools, with a focus on reliability and value. Bunnings offers Sidchrome garden auger bits, which are designed for everyday use in home gardens and light commercial settings.

This small auger bit from Sidchrome measures 10mm (3/8-inch) in diameter and 300mm (12 inches) in length, perfect for precision tasks like planting bulbs, seeds, or small plants. Constructed from high-quality carbon steel, it’s heat-treated to ensure a sharp cutting edge that stays sharp through repeated use. The spiral design features a narrow pitch, which is effective at removing fine soil without disturbing surrounding areas—important for delicate gardening tasks where preserving existing plants is key. The tip is pointed and self-centering, making it easy to start holes accurately, even in hard soil. The shank is a round 10mm diameter, fitting most standard drill chucks, and it works with both corded and cordless drills (12V and above). A notable feature is the black oxide finish, which provides corrosion resistance, ensuring the bit remains in good condition even when stored in damp environments. This model is affordably priced, making it a great option for casual gardeners or those on a budget who need a reliable tool for light-duty tasks.

For larger jobs, Bunnings stocks the Sidchrome SCMT1524, a 15mm (5/8-inch) diameter, 600mm (24-inch) length auger bit designed for deeper holes. Built with a thicker carbon steel body than the smaller model, it’s reinforced at the shank-to-bit junction to prevent bending under high torque—critical for drilling through compacted soil or small roots. The spiral flighting is wider and deeper, allowing for efficient removal of larger soil clumps, making it suitable for use in clay or loamy soils. The tip is hardened and ground to a sharp point, ensuring fast penetration and reducing the effort needed to start drilling. The shank is hexagonal, providing a secure grip in the drill chuck to prevent slipping, even when working with high-torque drills. This bit is compatible with most 18V to 24V cordless drills and corded drills with a minimum 500W motor, making it versatile for different users. It’s ideal for tasks like planting medium-sized shrubs, installing garden stakes, or digging holes for small fence posts, offering heavy-duty performance at a mid-range price point that balances quality and affordability.

In addition to the major brands above, Bunnings carries several other garden auger drill bits and specialty models to cater to specific needs, including ice augers (for winter gardening or outdoor ice projects) and extended-length bits for deep drilling.

Mac Allister is a budget-friendly brand available at Bunnings, and this 100mm diameter, 500mm length auger bit is designed for home gardeners seeking affordability without sacrificing basic performance. Made from carbon steel with a painted finish for rust resistance, it features a spiral flighting design that removes soil efficiently in sandy or loamy soils. The tip is sharpened for easy penetration, and the round shank fits standard drill chucks. While it’s not as durable as professional-grade bits, it’s suitable for occasional use in small to medium gardens, making it a popular choice for renters or homeowners with limited gardening needs.

Draper is a UK-based brand known for its tools, and Bunnings stocks this extended-length auger bit for deep drilling tasks. Measuring 150mm in diameter and 750mm in length, it’s designed to dig holes up to 750mm deep, ideal for planting large trees, installing deep fence posts, or creating holes for structural supports. Constructed from hardened steel, it features a reinforced spiral design with extra-thick flighting to handle heavy soil and small rocks. The hexagonal shank ensures a secure fit in high-torque drills, and it’s compatible with most 20V to 24V cordless drills and corded models. This bit is popular among landscapers and serious DIYers working on large-scale projects, where depth and durability are critical.

Arbortec specializes in tree care tools, and this auger bit is designed specifically for planting trees and large shrubs. It features a unique “tree-friendly” spiral design that minimizes soil disturbance around the root ball, promoting healthier plant growth. The 80mm diameter is ideal for most young trees, and the 400mm length ensures enough depth for proper root placement. Made from high-carbon steel with a sharp, self-centering tip, it drills quickly through most soil types, and the hexagonal shank fits securely in standard drills. This model is a favorite among arborists and gardeners focused on sustainable planting practices, available at Bunnings for those prioritizing plant health in their gardening projects.

When selecting a garden auger drill bit from Bunnings, several factors should be considered to ensure the tool meets your specific needs. First, size is critical: diameter determines the hole width (smaller for bulbs/flowers, larger for trees/fence posts), while length affects depth (shorter for shallow holes, longer for deep planting or posts). Second, material impacts durability—high-carbon steel is suitable for home use, while alloy steel or carbide-tipped bits are better for tough soils or professional use. Third, compatibility with your drill: check shank type (hexagonal vs. round) and drill voltage/power (higher torque is needed for large or deep holes). Fourth, soil type matters: clay soils require bits with wide, efficient flutes to prevent clogging, while rocky soils need hardened tips to resist damage. Finally, brand reputation and price: DIY users may opt for Ryobi or Ozito for affordability, while professionals may prefer Milwaukee or DeWalt for long-term durability.

In conclusion, Bunnings offers a diverse range of garden auger drill bits from leading brands, ensuring there’s a tool for every gardening task, budget, and user skill level. From small, precision bits for bulbs to heavy-duty, extended-length models for large trees and fence posts, these tools are designed to make digging easier, faster, and more efficient. By considering factors like size, material, compatibility, and soil type, you can select the perfect auger bit from Bunnings to tackle your next gardening or landscaping project with confidence. Whether you’re a casual DIYer or a professional tradesperson, the right garden auger drill bit will save you time and effort, allowing you to focus on creating and maintaining a beautiful outdoor space.