Neiko 10170A Electric Drill Bit Sharpener, Dual Heads | 3.5mm - 16mm (1/8" - 5/8") | 1420 RPM / 1720 RPM Allows you to extend the useful life of bits, maintain high quality bits Includes two heads with clearly marked guide holes; Small head fits bits from 3.5mm - 10mm (1/8" - 3/8"); Large head fits bits from 8mm-16mm (5/16"-5/8") \Works with both carbon steel and high speed steel (carbide); For bits used on wood, metal and more; Adjustable degree of grinding (split-point and standard twist) Thermal protection stops overheating while rubber feet provide stability, prevent slippage and housed in high impact plastic for durability Specs: Large head: 0.5 Amp motor, 1720 RPM (60 Hz), WA8OL7 grinding wheel; Small head: 0.4 Amp motor, 1420 RPM (50 Hz), A8OL7 grinding wheel; Internal AC adapter, 6-foot power cable