GM Performance Parts, 1/2 Inch Drive, Electric Impact Wrench (GM2813) 1/2 inch square drive. 120 volts, 7.5 amps. Double insulated for safety Delivers up to 240 foot pounds of torque. 2,100 RPM no load speed. 2,700 impacts per minute Metal gear housing for durability with 100% ball bearing construction Forward/reverse rocker switch for one hand operation Great tool for tough installations where an air compressor is not available