Walter Surface Technologies 01M557 Prentice Drill Bit 57/64" 135deg

Heavy-duty 57/64" cobalt drill bit

The Walter Surface Technologies 01M557 Prentice bit is a heavy-duty large-diameter drill bit designed for portable drills, drill presses and magnetic base drills with a ½” chuck. Its cobalt blend construction and extra-hard tips deliver extended life and more holes between re-sharpenings. The 135-degree point geometry eliminates the need for pre-drilling, while three flats on the shank prevent slippage inside the chuck.

Suited for steel and stainless drilling

This bit suits professionals drilling mild steel, non-ferrous metals and stainless steel who want faster drilling and fewer bit changes. The SST treatment and exclusive point geometry support high-volume work without pilot holes. Buyers who need smaller diameters, longer flute lengths or bits for wood and masonry should look at other options.

57/64" diameter with 135-degree point

The decisive specification is the 57/64-inch drill diameter combined with a 135-degree point angle, which determines the hole size you can produce and the self-centring behaviour in hard metals. Match this diameter and point angle to your application and chuck capacity before purchasing.