01M560 - Walter SST+ 15/16" Prentice Drill Bit with 1/2" Reduced Shank

Drill Large Holes in Stainless Without the Struggle

For welders and fabricators, drilling large diameter holes in stainless steel or heavy plate can often be a frustrating task, typically requiring bulky magnetic drills or stationary presses. The Walter 01M560 15/16" SST+ Prentice Drill changes the game by putting heavy-duty drilling power into your standard 1/2" chuck equipment. Whether you are working on a custom fabrication project, modifying a pipe fitting, or repairing heavy machinery in the field, this bit is designed to bite hard and cut true, even in the toughest alloys.

The secret to its performance lies in the cobalt blend construction. Unlike standard black oxide bits that burn up the moment they hit a hard spot in stainless steel, the SST+ withstands the heat and keeps cutting. This means you get more holes per bit and spend less time sharpening or replacing tools. The "Prentice" design features a reduced shank that fits standard drills, but Walter takes it a step further with three machined flats on the shank. If you've ever had a large bit spin inside your chuck, ruining the shank and stalling your work, you know how important this is. The flats lock the bit securely in place, ensuring that when you pull the trigger, the bit turns, no matter how much torque is required.

Accuracy is also built right into the tip. The exclusive self-centering geometry means you can place the tip exactly where you want it—even on round surfaces like pipes—and it will start drilling immediately without wandering. You can skip the center punch and the pilot hole, saving you valuable time on every job. The bronze surface treatment helps clear chips out of the hole, keeping the bit cooler and preventing binding. When your fabrication job calls for a 15/16" hole and you need it done right the first time, reach for the Walter SST+.