The Diablo DSF2562 2-9/16 Inch Dia. SPEEDemon Self Feed Bit is a large-diameter self-feed drill bit built for boring clean, fast holes in soft wood. This is a self-feed bit designed for high-speed wood drilling in framing, rough-ins, and joist work. Model Number: DSF2562. If you are running pipe, conduit, or other rough-in work and need a wide hole without wasting time leaning on the drill, this bit is made for that job.

What matters here is how the bit feeds itself. Diablo uses an aggressive low thread count feed screw that pulls the bit into the material while helping reduce pitch build-up. In plain terms, that means quicker starts, less fighting the tool, and faster hole making when you are drilling repeated holes in wood framing. Diablo rates this design for up to 2X faster hole making and up to 2X more holes per battery charge, which matters when you are using a cordless drill and trying to keep moving.

The cutting end uses a precision heat forged 2-cutter head made from premium steel on fully automated equipment. That matters because a big self-feed bit has to stay balanced and cut evenly. A sloppy cutter chatters, tears up the hole, and puts more load on the drill. The forged 2-cutter design on this SPEEDemon bit is built to drill smoother and hold up longer under repeated boring in soft woods.

At 2-9/16 inches in diameter, this bit is sized for larger pass-through holes where a standard spade bit is not the right answer. The 5-1/8 inch overall length keeps it compact enough for general rough-in work, while the 7/16 inch hex shank gives you a solid drive connection for heavy boring. That larger shank size is what you want on a bit in this class because it helps transfer torque more securely than smaller shanks when the bit starts pulling hard.

Diablo also addresses a common failure point on self-feed bits: the screw. The replaceable feed screw uses a pull-out stop design that helps prevent the screw from slipping out when the bit is removed from the material. That is a practical feature, not fluff. On the job, losing or damaging a feed screw can stop the whole operation, so having a more secure design plus a replacement feed screw in the package is a real advantage.

This bit is best suited for pros and serious DIY users doing plumbing, electrical, HVAC, carpentry, and general framing work in soft wood. If you need fast, repeatable large-diameter holes in joists, studs, or similar wood members, this is the kind of self-feed bit that earns its place in the drill bag. If your work is mostly metal or mixed material cutting, this is not that tool. It is purpose-built for boring wood quickly and efficiently.

Diablo DSF2562 2-9/16 Inch Dia. SPEEDemon Self Feed Bit for fast rough-in drilling

This is the kind of bit you buy when hole size and speed matter more than messing around with smaller wood-boring bits.

• Who it's for: Plumbers, electricians, HVAC installers, framers, and remodelers drilling large holes in soft wood members.
• Why it stands out: The forged 2-cutter head, aggressive feed screw, and replaceable screw setup make it more job-ready than a basic large spade bit.
• Worth knowing: This is a purpose-built wood-boring self-feed bit with a 7/16 inch hex shank, so make sure your drill is up to heavy large-diameter boring work.

• What material is this bit designed to drill? This self-feed bit is designed for soft wood drilling.
• What is the shank size? It uses a 7/16 inch hex shank.
• Is the feed screw replaceable? Yes. The product description states that it uses a replaceable feed screw with a pull-out stop design.
• How large of a hole does it cut? The cutting diameter is 2-9/16 inches.