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Walter 01M544 11/16" SST+ 135° 1/2" Prentice Drill Bit Size:1 Pack Innovative press fit silicone sealWalter 01M544 11 16" SST+ 135 1 2" Prentice Drill Bit SST+ 1 2" Prentice are heavy duty large diameter drill bits for use in portable drills, drill presses and magnetic base drills with 1 2" chuck capacity. Their extra hard tips allow for the drilling of many more holes between re sharpenings. They are made with a cobalt blend for longer life. Drill Size: 11 16" Flute Length: 3 1 8" Overall Length: 6" For high tensile steel, fits in a 1 2" chuck 3