1/2” DRIVE SAE, STUD SETTER SET The Stud Bolt Setter is a special socket for installing a stud bolt. The bolt contact with a steel ball to prevent the bolt from sticking onto the socket. After installing the bolt, turn anti-clockwise to remove the socket. Input Drive Size: 1/2" Drive Shape: Square Length: 44mm Type: St 1/2 Sq. Dr. Stud Bolt Setter 1/4 X 28UNF Length 37mm