Walter SST+ 9/16" Cobalt Prentice Drill Bit with 1/2" Shank

Drill Bigger Holes with Your Standard Drill

Stop struggling to drill large holes with equipment that can't handle the job. The Walter 01M536 9/16" SST+ Prentice Drill Bit is the solution for welders and fabricators who need to drill 9/16-inch holes but only have a standard 1/2-inch drill chuck. This "Prentice" style bit features a turned-down shank, allowing you to fit a larger cutter into your portable drill, mag drill, or drill press without buying an adapter or a bigger machine.

We all know the frustration of a drill bit spinning in the chuck just when you're about to break through. Walter has solved this problem by machining three flat sides onto the shank. These flats give your chuck jaws a solid surface to grab onto, ensuring zero slippage even when you are leaning into a tough piece of stainless steel. This positive grip means more torque goes into the cut and less time is wasted tightening your chuck.

Built for the toughest shop environments, this bit is made with a special cobalt blend that laughs at heat. Standard high-speed steel bits can burn up quickly on stainless steel, but the SST+ stays sharp longer, giving you more holes per dollar. Plus, the exclusive self-centering tip design means you can skip the center punch. Just line it up and pull the trigger—the bit won't walk, even on round tubing or curved surfaces. The bronze surface treatment helps chips slide out smoothly, keeping the bit cool and cutting fast.

Whether you are drilling out broken bolts, fabricating structural frames, or working on a custom truck bed, this Walter drill bit is a toolbox essential. It turns your standard hand drill into a heavy-duty hole-making machine.