01M539 - Walter SST+ 39/64-Inch Prentice Drill Bit with 1/2-Inch Shank

Heavy-Duty Drilling Performance with Walter SST+ Technology

The Walter 01M539 SST+ 39/64" Prentice Drill Bit is a premium cutting tool engineered for the most demanding industrial applications. Designed to bridge the gap between large-diameter hole requirements and standard equipment limitations, this bit features a reduced 1/2-inch shank. This allows operators to drill holes larger than their chuck capacity using standard portable drills, drill presses, or magnetic base units. The "Prentice" style, often referred to as Silver & Deming, is essential for maintenance and fabrication environments where versatility is key.

At the core of this drill bit's performance is Walter's proprietary cobalt blend material. Unlike standard high-speed steel (HSS) bits that dull quickly when facing hardened materials, the SST+ cobalt formulation resists high heat and abrasion. This makes it an exceptional choice for drilling through stainless steel, mild steel, and various non-ferrous metals. To further enhance longevity, the bit undergoes a special bronze SST surface treatment. This coating acts as a lubricant and heat deflector, significantly reducing friction during the cut and allowing for smoother chip evacuation.

Operational efficiency is maximized through Walter's exclusive point geometry. The self-centering tip bites into the material immediately upon contact, eliminating the common issue of "walking" and removing the need for time-consuming pre-drilling or pilot holes. Furthermore, the shank is machined with three distinct flats. These flats lock into the drill chuck jaws, ensuring a positive drive that prevents the bit from spinning or slipping under heavy torque loads. Whether you are working on round surfaces or flat plate, the Walter 01M539 delivers precise, clean holes with minimal effort.