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 3/8in Sq. Dr. 14 Piece Set: Surface Drive Sockets (P/N ESI3217M-10)
Koken USA 3/8in Sq. Dr. 17 Piece Set: Surface Drive Sockets (P/N ESI3001)