These studs fit 1927-1959 Chevrolet & GMC cars & trucks. They are a replacement stud for tie rod ends, drag link ends and idler arms. To install a new ball, use a 1/2" drill bit and drill the bottom of the shank down about 1/8. Press out the ball in a hydraulic press. Press in the new ball stud. CAUTION: Be sure the new ball is fully seated in the arm and down tight (clamp in place if necessary). Weld the new ball stud in place. Have a certified welder do this job to assure a good quality weld since a failure of this part could be catastrophic. DIMENSIONS: 1" DIA. BALL WITH .532" SHANK Specific Applications: 1927-1959 Passenger & 1/2 Ton Truck - TIE ROD ONLY; 1934-1946 1/2 Ton Truck - DRAG LINK ONLY; 1949-1954 Passenger - IDLER ARM ONLY