01M533 - Walter SST+ 33/64" Cobalt Prentice Drill Bit with 1/2" Shank

High-Performance Drilling for Tough Alloys

The Walter 01M533 SST+ Prentice Drill Bit is an industrial-grade cutting tool engineered for precision and longevity in demanding metalworking environments. Designed with a 33/64-inch diameter, this bit features a reduced 1/2-inch shank, making it compatible with a wide range of portable power drills, drill presses, and magnetic drilling units that are limited to a half-inch chuck capacity. This "Prentice" style design bridges the gap between standard tooling and large-diameter hole creation, offering fabricators flexibility without the need for specialized heavy machinery.

At the core of the SST+ series is a proprietary cobalt blend high-speed steel formulation. This material composition provides exceptional hot hardness, allowing the bit to maintain its cutting edge even when subjected to the high temperatures generated during aggressive drilling in stainless steel and other hard alloys. The bit is finished with a specialized bronze SST surface treatment, which acts to reduce friction coefficient and improve chip flow, thereby minimizing heat buildup and preventing the premature dulling often associated with drilling ferrous metals.

Operational efficiency is further enhanced by the tool's advanced geometry. The tip features a self-centering point that bites into the material immediately upon contact, effectively eliminating the "walking" common with standard bits and removing the necessity for pre-drilling or center punching. Additionally, the shank is machined with three distinct flats. This tri-flat design locks the bit securely into the chuck jaws, ensuring positive torque transmission and completely eliminating the frustration of the bit spinning inside the chuck under heavy load. For professionals requiring reliable, accurate, and fast hole production in mild steel, stainless steel, and non-ferrous metals, the Walter SST+ Prentice drill is a superior choice.