01M557 - Walter SST+ 57/64 Inch Cobalt Prentice Drill Bit with 1/2 Inch Shank

Heavy-Duty Precision for Large Diameter Drilling

The Walter 01M557 57/64" SST+ Prentice Drill Bit is an industrial-grade cutting tool engineered to deliver superior performance in the most demanding metalworking environments. Designed specifically for drilling large diameter holes, this bit bridges the gap between stationary precision and portable convenience. It is manufactured from a high-performance cobalt blend, which provides exceptional hot hardness and wear resistance. This material composition is critical when drilling tough alloys such as stainless steel, where standard high-speed steel bits often fail due to excessive heat buildup.

One of the standout features of the SST+ Prentice line is its intelligent shank design. The bit features a 1/2-inch reduced shank equipped with three precision-ground flats. This design element addresses a common frustration in heavy-duty drilling: bit slippage. By locking securely into the chuck jaws, the three flats ensure positive torque transfer, allowing the drill to utilize the full power of the drive motor without spinning inside the chuck. This makes the 01M557 compatible with a wide range of equipment, including portable power drills, stationary drill presses, and magnetic base drills that have a standard 1/2-inch chuck capacity.

Efficiency is at the core of the Walter SST+ design. The exclusive point geometry is self-centering, which means the bit bites into the material immediately upon contact. This eliminates the tendency for the bit to "walk" or wander across the workpiece, thereby removing the need for center punching or pilot drilling. For fabricators and maintenance professionals, this translates to significant time savings and improved accuracy. Additionally, the special bronze SST surface treatment reduces friction during the cut, promoting smoother chip evacuation and further extending the tool's service life. Whether you are working with mild steel, non-ferrous metals, or hardened stainless alloys, this drill bit provides the reliability and cut quality required for professional results.