1/2” 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: 1/2" Drive Shape: Square Length: 49mm Type: Impact Stud 1/2 Sq. Dr. Stud Bolt Setter M12 X 1.75 Length 49mm