ARP main stud kits are made from 8740 chromoly steel and have a 190,000 psi tensile-strength rating. They are precision centerless-ground and thread-rolled to Mil-S-8879 specs, with a black oxide finish for corrosion resistance. The kits come complete with hardened washers and high-strength hex nuts. Experience the ultimate in strength and durability with ARP Main Stud kits. Made from 8740 chromoly steel, these studs boast a 190,000 psi tensile-strength rating and are precision centerless-ground and thread-rolled to Mil-S-8879 specs. The black oxide finish not only adds a sleek look, but also provides excellent corrosion resistance. With hardened washers and high-strength hex nuts included, this kit has everything you need for a reliable and long-lasting engine. Upgrade to ARP Main Stud kits and feel the difference in your vehicle's performance!