01M535 - Walter SST+ 35/64 Cobalt Prentice Drill Bit with 1/2 Shank

Heavy-Duty Drilling Performance with Walter SST+ Prentice Bits

The Walter 01M535 SST+ Prentice Drill Bit is a premium cutting tool designed to bridge the gap between large-diameter hole requirements and standard equipment capacity. Measuring 35/64 inches in diameter, this bit features a precision-engineered reduced shank turned down to 1/2 inch. This "Prentice" style design allows fabricators and maintenance professionals to drill holes larger than half an inch using standard portable power drills, drill presses, or magnetic base drills that are limited to a 1/2-inch chuck capacity.

Durability is at the core of the SST+ line. Manufactured from a high-grade cobalt blend, these drill bits are specifically formulated to withstand the intense heat generated when drilling through hard metals like stainless steel and other ferrous alloys. The cobalt content maintains the hardness of the cutting edge at higher temperatures, significantly extending the tool's life compared to standard high-speed steel (HSS) bits. This means fewer bit changes, less downtime for resharpening, and a lower cost per hole over the lifespan of the tool.

Operational efficiency is further enhanced by Walter's exclusive point geometry. The self-centering tip bites into the material immediately upon contact, eliminating the "walking" often associated with large drill bits. This feature removes the need for pre-drilling pilot holes or using a center punch, streamlining your workflow. Additionally, the shank is machined with three distinct flats. These flats lock into the chuck jaws, providing a positive drive that prevents the bit from spinning or slipping under heavy torque loads—a common frustration with round-shank large-diameter bits. Finished with a bronze SST surface treatment to reduce friction, the Walter 01M535 is the ultimate solution for heavy-duty drilling tasks.