The Diablo DAG3160 1-1/2 Inch x 17-1/2 Inch Auger Bit is a long wood-boring accessory built for drilling large, clean holes in framing lumber, plywood, and nail-embedded wood. This is an auger bit designed for boring deep holes in wood during rough carpentry, remodeling, and general construction work. Model Number DAG3160. If you are running pipe, conduit, wire, or bolts through studs and joists, this is the kind of bit made for that job instead of light-duty general-purpose drilling.

What separates this auger bit from a basic wood bit is the cutting geometry. Diablo uses a two-step cutting action to help the bit start accurately and leave a cleaner finished hole. That matters when you are boring repeated holes through framing members and do not want the bit skating across the surface before it bites. The dual cutting edge design also helps the bit move through the cut with less chatter, which makes the drilling experience feel smoother in clean wood and in wood that has hidden fasteners.

The DAG3160 is sized at 1-1/2 inches in diameter with a 17-1/2 inch overall length, giving you the reach needed for thick stock, built-up framing, and access through deeper cavities. That long reach is useful when a shorter auger bit will not clear the work or when you need to stay straight through wider material. For plumbers, electricians, and framing crews, that extra length can mean fewer repositioning moves and fewer partial passes.

Diablo also built this bit for tougher real-world lumber. The Dura-Tip is intended for extreme durability in nail-embedded wood, and the deep flutes are there for a practical reason: they move chips out of the hole faster. Faster chip evacuation keeps the bit cutting instead of packing up, which helps you drill more holes efficiently and reduces the effort needed to keep the bit advancing. On cordless tools, better chip removal can also help stretch runtime because the tool is not fighting a clogged cut.

The 7/16 inch hex quick-change shank is another jobsite-friendly detail. Large auger bits put a lot of load on the tool, so a secure shank matters. This shank style is designed to increase stability and durability in compatible corded and cordless impact wrenches and drill drivers. In plain terms, it gives the bit a more confident connection so you can lean into boring work without the bit feeling loose in the tool.

In use, the Diablo DAG3160 1-1/2 Inch x 17-1/2 Inch Auger Bit makes the most sense for anyone drilling larger pass-through holes in wood framing. That includes electrical rough-in, plumbing rough-in, remodeling crews opening up existing structures, and carpenters who regularly work around old lumber with embedded nails. It is also a solid pick for serious DIY users doing structural work, deck framing, shed builds, or additions where a standard spade bit is either too rough or not durable enough for the material.

If your work is mostly small pilot holes or finish carpentry, this bit is overkill. But if you need a large-diameter auger bit that can handle wood drilling, nail-embedded wood, and repeated boring in tough framing stock, this Diablo model is built for that kind of abuse.

Diablo DAG3160 1-1/2 Inch x 17-1/2 Inch Auger Bit for tough framing work

This is a smart buy if you drill big holes in framing and do not want to baby your bit every time the wood gets ugly.

• Who it's for: Framing crews, electricians, plumbers, remodelers, and serious DIY users boring large holes through wood and nail-embedded lumber.
• Why it stands out: The long reach, Dura-Tip, dual cutting edges, and deep flutes make it better suited for real jobsite wood drilling than a basic general-purpose bit.
• Worth knowing: This is a single large-diameter auger bit, not a set, and it is best matched with a compatible tool that can control the load of a 1-1/2 inch boring application.

• What kind of bit is this? It is an auger bit designed for boring large holes in wood and nail-embedded wood.
• What size hole does it drill? The bit diameter is 1-1/2 inches.
• How long is the bit? The listed length is 17-1/2 inches.
• What shank does it use? It has a 7/16 inch hex shank with a quick-change design.
• Can it be used in wood with nails? Yes. Diablo states it is designed for nail-embedded wood applications.