1/2” DRIVE, STUD SETTER 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: Stud Bolt Setter Output Size: 12mm x 1.25mm