Drill bit sharpener grinding wheel dia 1 in drill dia/capacity 3/32 to 1/2 in 2.5 to 13.0mm max rpm 20 000 voltage 110 1.75 amps 1/7 hp features 118 or 135 deg selectable sharpening angle grinding wheel type diamond 180 grit for use with standard and split point twist hss cobalt carbide tin and masonary bits ul listed includes 3/32 to 1/2 in chuck