1/2” DRIVE, 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 Type: Stud Bolt Setter Set Includes: 4103M Stud Bolt Setters: 6(1.0), 8(1.25), 10(1.5), 12(1.75) Metal Case: W130xH65xT26mm