Koken USA 1/2" Surface Drive Sockets are designed to retain contact with the flat sides of a nut to transmit high torque and reduce nut wear. These sockets are ideal for use on polished nuts, aluminum nuts and nuts with worn out points.
Koken USA 1/2in Sq. Dr. 15 Piece Set: Surface Drive Sockets (P/N ESI4001)
Koken USA 1/2in Sq. Dr. 22 Piece Set: Surface Drive Sockets (P/N ESI4251M-10)