01M559 - Walter SST+ 59/64-Inch Prentice Drill Bit with 1/2-Inch Shank

Stop Burning Bits on Stainless Steel

Every welder knows the frustration of trying to drill a large hole in a stainless steel tank or a heavy structural beam, only to have the bit scream, smoke, and dull out halfway through. The Walter SST+ Prentice Drill Bit is the solution for fabricators who need tools that work as hard as they do. This 59/64-inch bit is built specifically to handle the heat and stress of drilling through tough metals without backing down. If you are working on truck frames, installing heavy machinery, or fabricating custom stainless parts, this is the bit you want in your toolbox.

The secret to its durability is the cobalt blend construction. Unlike cheap standard bits that soften when they get hot, this bit maintains its hardness, cutting through stainless steel and hard alloys cleanly. It features a "Prentice" style shank, which means the cutting end is a massive 59/64 inches, but the shank is turned down to 1/2 inch. This allows you to use your standard heavy-duty hand drill or mag drill to make large holes. Crucially, the shank has three flat sides ground into it. When you tighten your chuck, the jaws lock onto these flats, making it impossible for the bit to spin inside the chuck. This means 100% of your drill's power goes into the cut, not into ruining your chuck jaws.

Time is money in the shop and out in the field. With the Walter SST+ exclusive point geometry, you can skip the center punch and the pilot hole. Just line it up and pull the trigger; the bit centers itself and bites immediately. The bronze surface treatment helps chips slide out of the hole easily, keeping the cut cool and preventing binding. Whether you are drilling mild steel, aluminum, or hardened stainless, the Walter 01M559 gives you the confidence that you will get through the material in one shot, every time.