01M552 - Walter 13/16" SST+ Cobalt Prentice Drill Bit with 1/2" Shank

Precision Cobalt Drilling for Stainless and Hard Alloys

For professional welders and fabricators, the Walter 13/16" SST+ Prentice Drill (SKU: 01M552) represents the pinnacle of hole-making performance in hard metals. When working with stainless steel, work-hardening is a constant enemy; standard drill bits often dull quickly, generating excess heat that hardens the material and makes further drilling impossible. The SST+ Prentice drill combats this with a high-performance cobalt blend substrate that maintains hardness at high temperatures, allowing the cutting edge to stay sharp and bite continuously into the material rather than rubbing and glazing the surface.

The geometry of the 01M552 is specifically tuned for heavy-duty metalworking. It features a unique point design that is self-centering, allowing you to start a 13/16" hole exactly where you need it without the extra step of center punching or pilot drilling. This is particularly advantageous when working on curved surfaces or pipe, where standard bits tend to wander. The "Prentice" style 1/2-inch reduced shank is machined with three flats, a critical feature for welders using high-torque portable drills. These flats ensure the chuck jaws drive the bit positively, eliminating the frustration of the bit slipping stationary while the drill motor spins, a scenario that ruins shanks and wastes time.

Chip evacuation is managed efficiently through the bit's optimized helix angle and the Bronze SST surface treatment. This treatment is not merely cosmetic; it provides a low-friction coefficient that helps lift heavy chips out of the hole, preventing packing and heat buildup. Whether you are drilling mounting holes in heavy plate, fabricating structural frames, or modifying stainless steel vessels, the Walter SST+ Prentice drill delivers consistent, round, and burr-free holes. It is the ideal choice for users who demand the cutting performance of a magnetic drill annular cutter but require the versatility of a twist drill.