PROTO 19-Piece Impact Socket Set, SAE, 1/2in Drive, 3/8in to 1-1/2in Opening, 6-Point

The TorquePlus design is a high performance drive configuration which allows for quick and easy socket engagement to the fastener flats, not the corners Configuration employs a radius-corner design, shifting contact area and stress away from the fastener corners and distributing contact stresses over a large area of the socket, minimizing slippage