01M612 - Walter 1-3/16 Inch SST+ Cobalt Prentice Drill Bit with 1/2 Inch Shank

Drill Bigger Holes with Your Standard Drill

Need to drill a hole over an inch wide but only have a standard 1/2-inch chuck drill? The Walter 1-3/16" SST+ Prentice Drill Bit (01M612) is the solution you need. Known in the trade as a "Prentice" or "Silver & Deming" style bit, it features a large cutting diameter turned down to a 1/2-inch shank, making it compatible with most heavy-duty portable drills and drill presses. This bit is a workhorse for welders and fabricators who need to punch large holes in mild steel, stainless steel, or aluminum without setting up a large radial arm drill or machining center.

Walter Surface Technologies has built this bit to last. It isn't just standard steel; it is crafted with a special cobalt blend that resists the intense heat generated when drilling hard metals. This means you get more holes per bit and spend less time sharpening or replacing tools. If you work with stainless steel, you know how easily it can work-harden if a bit dulls or rubs; the SST+ stays sharp and cuts freely to prevent this. The bronze surface treatment further helps by reducing friction, letting the chips slide out easily.

Frustrated by bits that slip in the chuck when the going gets tough? This Walter bit features a "Secure Grip" shank with three flat sides. Once you tighten your chuck jaws onto these flats, the bit is locked in tight—no more spinning, no more chewed-up shanks. Plus, the advanced point geometry is designed to start drilling on contact. You can skip the center punch and the pilot hole; just line it up and pull the trigger. For reliable, fast, and clean large-diameter drilling, trust Walter SST+.