01M556 - Walter SST+ 7/8-Inch Cobalt Prentice Drill Bit

Unstoppable Drilling Power for Metal Fabricators

When you are out in the field or on the shop floor, you need a drill bit that can handle the heat. The Walter SST+ 7/8-Inch Prentice Drill (SKU: 01M556) is built for welders and fabricators who encounter a variety of metals, from mild steel to hardened stainless. This isn't your average hardware store bit; it is an industrial-grade solution designed to drill large holes using your existing 1/2-inch chuck power tools. Whether you are retrofitting a mounting plate or fabricating structural beams, this bit delivers the performance required to get the job done quickly.

The secret to the SST+ performance lies in its "Super Speed Tip" technology. The aggressive point geometry is designed to penetrate metal faster than standard high-speed steel bits. It is self-centering, meaning it won't "walk" across the workpiece when you start drilling, even on curved surfaces. This precision allows you to skip the pilot hole and go straight to the final diameter, saving you valuable time on every hole. The body of the bit is crafted from a cobalt-infused high-speed steel, providing the red-hardness necessary to cut through stainless steel without burning up the tip.

Torque transfer is critical when drilling 7/8-inch holes. Standard round shanks often slip under load, damaging both the bit and the drill chuck. The Walter 01M556 features a secure 1/2-inch shank with three ground flats. These flats align perfectly with the jaws of your drill chuck, providing a secure grip that prevents slippage entirely. Combined with the bronze surface treatment that aids in lubricity and chip removal, this drill bit offers a smooth, powerful drilling experience that reduces operator fatigue and maximizes productivity.