HEX SHANK QUICK CHANGE CONNECTORChange drill and driver bits fast and easy without having to re-chuckKnurled design for maximum gripCompact size for tight working spacesPositive locking mechanism for optimum bit retentionConnector fit all 3/8in and 1/2in Drive DrillsAccepts all 1/4" quick change and ball groove hex shank accessoriesMade in the USA