Delivers high torque with little exertion required on your part. The Mastercraft Maximum 8A impact wrench has a ½” (1.3 cm) square drive with friction ring system that securely holds sockets and adaptors. Aluminum alloy housing adds to its strength and durability. Forward and reverse switch provides more control. At 2,100 rpm (2700 ipm and 350 ft-lb torque, this impact wrench has a great power to weight ratio.