Easy drill sharpener with 1/4" Hex Shank. Use this drill bit sharpener with your power drill to quickly and easily sharpen drill bits from 5/64" to 1/2" (2mm to 12.5mm) Features: Safe and easy to use with the appropriate built in guides 100 Grit grinding stone Requires a power drill that operates between 2000 and 3500 RPM Overall dimensions: 3 1/8"(L) x 1 9/16"(W) x 7"(H) Angle stop degrees: 60º left Accommodates the following sizes: 5/64" to 13/64"(2mm 5mm) 7/32" to 21/64" (5mm 8mm) 1 1/32" to 1/2" (8mm 12.5mm)