3/4" Drive Impact Universal JointTight tolerances for snug fit on fastener Ball and spring design which allows for a 30 working angle Designed to withstand the high torque and force associated with impact tools in repetitive application Features two through holes and a groove to accept a Proto Retaining Ring or pin and O ring to help secure the socket to the drive tool anvil Position at appropriate angle to turn fasteners where obstructions prevent a straight application