Irwin 5/16 in. D X 7.5 in. L Auger Bit Carbon Steel

Upgrade your woodwork with the Irwin 5/16 in. D x 7.5 in. L Auger Bit. Built for clean, precise holes in softwood and hardwood alike, this bit combines durable construction with practical design choices that make every drilling session smoother and more efficient.

• Precise, purpose-built size: 5/16" diameter and 7.5" overall length give you deep pilot holes without overextending the bit, ideal for screws, dowels, and ledgers in cabinetry, furniture, and framing projects.
• Hex shank for reliable grip: 7/32" shank diameter with a hex profile minimizes cam-out and wobble, enabling quick changes and steady performance in both drill and impact drivers.
• Heat-treated carbon steel: Treated for hardness and wear resistance, increasing bit life when drilling through tougher wood grains and avoiding premature dulling.
• Efficient wood-optimized design: Auger geometry pulls chips up and out of the hole, reducing binding and producing cleaner, round holes with less tear-out.
• Single-piece convenience: Carded packaging keeps the tool protected and easy to store, ready for your next project.
• Trusted brand: Irwin’s long-standing reputation for durable woodworking bits means you’re choosing a tool that stands up to repeated use on demanding jobs.

Who this is for

Carpenters, furniture makers, hobbyists, and DIY homeowners who need precise, deep holes in wood will appreciate the combination of length, hollow-cut efficiency, and a hex shank that works with a wide range of drill chucks. It’s especially useful for pre-drilling for screws, dowels, or hinges where clean, accurate holes matter most.

Practical use cases

• Wooden furniture assembly requiring deep pilot holes for dowels or screws
• Cabinetry and shelving installations where precise hinge and connector locations are critical
• Framing or repair work in thick boards where longer holes are needed

Specifications at a glance

• Diameter: 5/16 in
• Length: 7.5 in
• Shank diameter: 7/32 in
• Shank type: Hex shank
• Material: Carbon steel
• Heat treated: Yes
• Usage: Wood
• Package: Carded, 1 piece

Note: This product is distributed through authorized channels; sales on certain third-party marketplaces require written authorization. For dedicated woodworkers who demand reliability and long-lasting performance, the Irwin 5/16 in. D x 7.5 in. L Auger Bit is a true workhorse for precise, clean results every time.