Irwin® 91152 Silver & Deming HSS Fractional 1/2" Reduced Shank Drill Bit, 13/16"Irwin Silver and Deming High Speed Steel Fractional Drill Bit is made from M 7 high speed steel for high resistance to abrasion during tough drilling applications. Three flatted shank design provides better chuck grip and reduces slippage. Ideal for use in keyless chucks. All Silver and Deming bits are 6" long and feature a 1 2" reduced shank that fits all 1 2" drills. Standard 118 degree point for use in wood, metal, and plastic. Size: 13 16" Twist