Standard bolts for headers for most makes of heads. Heat treated steel.
ARP stud kits have 3/8" studs, nuts and washers. Set of 16. Includes 12 point nut.
ARP 12 point head bolt kit, 3/8"-16 x .750" UHC. Includes washers. Uses 3/8" 12 pt. socket. 170,000 PSI.
Premium quality steel header bolts by Dynatech®.