Irwin 91140 Silver and Deming Drill Bit, 5/8 in Dia, 6 in OAL, Spiral Flute, 1/2 in Dia Shank, Flat, Reduced Shank

M7 HSS for strength, heat-resistance and wear-resistance when drilling in wood, metal or plastic. Can be used with keyless chuck. Three-flatted shank design provides better chuck grip and reduces slippage. All silver and deming bits are 6 in long and feature a 1/2 in reduced shank that fits all 1/2 in drills.