1/2” DRIVE, STUD BOLT PULLER, SET The body design was changed to hexagonal shape to minimize tolerances. This shape is also effective to lessen excessive load on cages and rollers inside the body. Input Drive Size: 1/2" Drive Shape: Square Type: Screw and Stud Puller Set Output Sizes: 1/4, 5/16, 3/8, 1/2 Includes: 4 Stud Pullers and Metal Case