These high-strength ARP bolts are great for installing most accessories. The 180,000 psi tensile strength bolts are made of 8740 chrome moly with a black oxide finish. All bolts are packaged in sets of 5 bolts with matching washers. These bolts have a 3/8-16 UNC thread pitch and 1" under-head length (total shank length including threads). 7/16" hex head.