3/8" DRIVE, STUD SETTERThe 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: 3/8" Drive Shape: Square Length: 32mm Type: Stud Bolt S 3/8 Sq. Dr. Stud Bolt Setter M7 X 1.0 Length 32mm