01M542 - Walter SST+ 21/32" Cobalt Prentice Drill Bit with 1/2" Shank

Walter SST+ 21/32" Prentice Drill Bit | 01M542

The Walter 01M542 is a high-performance 21/32-inch SST+ Prentice drill bit engineered for heavy-duty industrial applications. Manufactured by Walter Surface Technologies, this tool is designed to bridge the gap between standard jobber bits and large-diameter hole creation requirements. The bit features a reduced 1/2-inch shank with three precision-ground flats, ensuring compatibility with standard 1/2-inch chucks found on portable power drills, drill presses, and magnetic base units. This shank design is critical for high-torque applications, as the flats positively lock into the chuck jaws to prevent slippage during operation.

Constructed from a premium cobalt blend, the SST+ series offers superior hardness and heat resistance compared to standard high-speed steel. This metallurgical composition allows the bit to maintain its cutting edge even when drilling through tough materials like stainless steel and other ferrous alloys. The tool is finished with a specialized bronze SST surface treatment, which reduces friction and aids in chip evacuation, further extending the tool's service life. The exclusive point geometry is self-centering, allowing for immediate penetration without the need for a center punch or pilot hole, even on curved surfaces.

This drill bit is specifically optimized for maintenance, repair, and fabrication environments where large diameter holes must be drilled efficiently. The robust design minimizes breakage and maximizes the number of holes drilled between sharpenings. Whether working on mild steel, non-ferrous metals, or hardened alloys, the Walter SST+ Prentice drill delivers consistent, precise results.