Hyundai HPT-IMRK-1 Kit ideal for changing tires, general assembly work and other workshop applications. The Air Ratchet has a light-weight die-cast aluminum body. It is designed for removing and installing spark plugs and engine parts. The compact head design allows flexibility in tight spaces. There is a conveniently located forward/reverse switch. The Impact Wrench is also made of a light-weight die-cast aluminum body, has a conveniently located forward/reverse switch with a compact ergonomic design. Specs for 1/2-Inch Impact Wrench - 7000 RPM, SCFM 4.0 Average at 90 PSI, Torque - 230 foot pounds. Specs for 3/8-Inch Air Ratchet - 160 RPM, SCFM 4.0 Average at 90 PSI, Torque - 50 foot pounds.