The Diablo DAG3040 9/16 Inch x 17-1/2 Inch Auger Bit is a long auger drill bit built for boring clean holes through wood and nail-embedded wood. This is a auger bit designed for wood drilling and rough-in boring. Model Number: DAG3040. If you are drilling through framing lumber, studs, joists, plywood, or older material where nails might be hiding, this bit is built for that kind of work.

What makes this bit different is how it cuts. Diablo uses a two-step cutting action to help produce precise, cleaner holes instead of the rough tear-out you can get from a basic wood-boring bit. The dual cutting edge design also keeps the drilling action smoother, which is a real help when you are leaning on a drill driver for repeated holes during electrical, plumbing, or general framing work.

The Dura-Tip is there for the jobs that usually chew up ordinary bits. In nail-embedded wood, tip life matters because one buried fastener can end the day for a cheaper auger bit. Diablo calls this bit out specifically for wood with nails, which makes it a practical choice for remodelers, service contractors, and anyone drilling in existing structures instead of clean new stock all day.

Chip removal is another big part of how an auger bit performs, especially when you are drilling deeper holes. The deep flutes on this bit are made to move chips out fast, which helps the bit keep cutting instead of binding up in the hole. In real use, that means less wasted motion backing out constantly and a better chance of getting through multiple holes efficiently on a cordless setup.

The long 17-1/2 inch overall length gives you added reach for thicker assemblies and harder-to-access boring tasks. That extra length is useful when you need to pass through stacked framing members or reach into awkward stud bays without switching to an extension. The 9/16 inch diameter also lands in a useful middle ground for common rough-in work where you need more capacity than a small twist bit but do not want to jump to a much larger self-feed size.

On the drive end, the 7/16 inch hex quick-change shank is set up for use in corded and cordless drill drivers and compatible impact tools. That matters because long wood-boring bits put a lot of load on the tool connection. A solid hex shank improves stability, helps reduce slipping in the chuck, and makes tool changes faster when you are moving between boring and fastening tasks.

This Diablo auger bit makes the most sense for electricians, plumbers, framers, remodelers, and serious DIY users who need one bit that can handle clean wood and the occasional surprise nail without turning into scrap. If your work lives in new framing, renovation, punch-list jobs, or service work where material conditions change from hole to hole, this is the kind of accessory that earns its spot in the bag.

Diablo DAG3040 9/16 Inch x 17-1/2 Inch Auger Bit for Rough-In Work That Fights Back

This is the kind of long auger bit you buy when standard wood bits are getting chewed up by real-world framing and remodel work.

• Who it's for: Electricians, plumbers, framers, remodelers, and serious DIY users boring repeated holes through wood or older framing where hidden nails are part of the job.
• Why it stands out: The combination of two-step cutting action, dual cutting edges, deep flutes, and a hex quick-change shank gives it a more job-ready setup than a basic auger bit.
• Worth knowing: This is a single 9/16 inch bit, not a set. It is a smart pick when you need this exact size and want something better suited to nail-embedded material.

• What material is this auger bit designed to drill? It is specified for wood, nail-embedded wood, plywood, hardwoods, and softwoods.
• Can this bit be used in cordless tools? Yes. It is designed for use in corded and cordless drill drivers and compatible impact tools.
• What shank does it use? It uses a 7/16 inch hex quick-change shank.
• How long is the bit? The product name and manufacturer part listing identify it as a 17-1/2 inch auger bit.