Impact universal joint adapter lets you reach fasteners in tight corners and spaces with power tools Ball spring design distributes torque evenly and works in a smooth 360 degree rotation Spring-loaded detent ball securely holds sockets in place Premium Chrome Molybdenum steel tempered with our proprietary heat treatment process to withstand more torque from power tools 3/4 in. drive The Capri Tools Impact Universal Joint helps you reach fasteners in tight corners and spaces with power tools. Ball spring design that distributes torque evenly and works in a smooth 360 degree rotation. It features spring-loaded detent balls that securely hold sockets in place.