The Diablo DSP1020 1/2 in. x 4 in. Spade Bit for Wood is a single wood-boring drill bit built for fast, clean hole drilling in wood. This is a spade bit designed for drilling through wood in cordless and corded drill drivers and impact drivers. Model Number: DSP1020. If you're running wire, pipe, conduit, or doing general framing and rough carpentry, this bit is made to move quickly without needing much pressure behind it.

What matters here is how the cutting design works in real use. Diablo's SPEED-TIP self-feed point is meant to pull the bit into the material faster than a traditional spade bit, so you spend less time leaning on the tool. The angled spur cutting edge is there to score the wood before the paddle clears material, which helps produce cleaner holes with reduced blowout. For anyone drilling repeated pass-through holes in studs, joists, or sheet goods, that combination saves time.

The paddle itself is optimized for chip evacuation, and that matters more than it sounds. When chips clear efficiently, the bit stays cutting instead of bogging down, especially when you're making multiple holes back to back. Diablo also calls out more holes per charge, which is a practical benefit if you're using a cordless impact driver or drill driver for rough-in work.

The shank setup is equally jobsite-friendly. This bit uses a 1/4 in. hex shank, so it drops into common impact drivers and drill drivers without adapters. Diablo's Impact Strong design is intended to improve shank stability and durability, which makes sense for users who prefer boring small to mid-size wood holes with the same driver they're already carrying for fastening.

At 1/2 in. diameter and 4 in. length, this is a straightforward size for general-purpose wood drilling where you need a clean pass-through hole without stepping up to a larger auger or specialty boring bit. It is sold as an individual bit, so it makes sense as a replacement size or a targeted add-on when you know exactly what diameter you need.

This bit is best suited to contractors, electricians, plumbers, HVAC installers, framers, remodelers, and serious DIY users who need speed and convenience more than finish-grade woodworking detail. If your work is rough-in, utility runs, or general wood boring, the Diablo DSP1020 1/2 in. x 4 in. Spade Bit for Wood is the right kind of simple: fast setup, common hex shank fit, and a tip design that is meant to keep the cut moving.

Diablo DSP1020 1/2 in. x 4 in. Spade Bit for Wood Keeps Rough-In Work Moving

This is the kind of bit you buy when speed and easy driver compatibility matter more than dressing up a finish-grade hole.

• Who it's for: Electricians, plumbers, HVAC installers, framers, remodelers, and DIY users boring wood holes with a drill driver or impact driver.
• Why it stands out: The self-feeding tip, chip-clearing paddle shape, and 1/4 in. hex shank all point to one thing: fast, convenient wood boring with common jobsite tools.
• Worth knowing: This is a single 1/2 in. spade bit, not a set, so it is best for buyers who know the exact size they need.

• What kind of bit is this? It is a spade bit for drilling wood.
• What tools does it fit? It is designed for cordless and corded impact drivers and drill drivers and uses a 1/4 in. hex shank.
• What size hole does it drill? This bit has a 1/2 in. diameter.
• Is this sold as a set? No. It is sold as an individual bit.