If an alternator bolt fails the loss of electrical power will be only one of the subsequent problems.ARPs bulletproof alternator bolts eliminate this concern and any pulley alignment issues. Made from premium grade 8740 chrome moly steel alloy and heat treated to a nominal 200.000 psi tensile strength this bolt will not bend under stress.Made in USA Set includes: 12 point nutFlat washer7/16 x 5-1/4 stud with 1 coarse thread on one end and 1 fine thread on the other