Walter SST+ 45/64-Inch Prentice Drill Bit with 1/2-Inch Shank

Precision Fabrication Drilling for Stainless and Steel

For professional welders and fabricators, the ability to modify parts on the fly is essential. The Walter 01M545 SST+ Prentice Drill Bit (45/64") is the ultimate solution for creating large, clean holes in metal structures without requiring a trip to the machine shop. Designed with the fabricator in mind, this bit features a "Prentice" or Silver & Deming style design, where the 45/64-inch cutting diameter is turned down to a standard 1/2-inch shank. This allows you to utilize the power of your heavy-duty handheld drill or magnetic drill to create bolt holes and pass-throughs directly on the assembly line or job site.

Drilling stainless steel is notoriously difficult due to its tendency to work-harden if the drill bit dulls or rubs. Walter has solved this with their SST+ cobalt blend formulation. This high-performance alloy resists the extreme heat generated at the cutting edge, keeping the bit sharp and cutting aggressively even through thick stainless plate. Combined with the unique Bronze SST surface treatment, the bit sheds chips efficiently and resists galling, ensuring a clean finish that requires minimal deburring before welding or bolting.

One of the most frustrating aspects of using large drill bits in portable drills is the tendency for the bit to slip in the chuck when the torque increases. The Walter 01M545 addresses this with a shank that features three ground flats. These flats provide a positive lock with the chuck jaws, ensuring that 100% of the drill's torque is transferred to the cutting edge. This feature is particularly valuable when breaking through the backside of the material, where snagging often occurs.

The point geometry of the SST+ line is another standout feature for welders. The exclusive point design is self-centering, meaning you can place the tip exactly where you need the hole and start drilling without the bit skating across the metal. This precision saves time on layout and prep work, allowing you to move faster from fabrication to final assembly. Whether you are enlarging existing holes or drilling new ones in structural beams, brackets, or pipe flanges, this bit provides the reliability and speed required in professional welding environments.

Invest in tooling that matches the quality of your welding. The Walter 01M545 offers a long service life, reducing the cost per hole and ensuring you aren't constantly stopping to swap out burned-up bits. It is compatible with mild steel, stainless steel, and aluminum, making it a versatile choice for diverse fabrication projects.