When bolts just aren't strong enough, you have to go to main studs. Our main cap stud kit are made from 180,000PSI 8740 steel, the strongest main studs you can buy for the big block Mopar engine. We also inlclude hardened and parallel ground washers, as well as custom 12 point nuts for precision torquing and extra clearance. A great, super strong set for the money.