ARP 234-4317 12-Point Pro Cylinder Head Stud Kit for 2004-newer GM Gen III IV 4.8L 5.3L 6.0L 6.2L EnginesFastener Style: Stud Undercut Stud: No Head Style: 12 point Fastener Material: 8740 chromoly Fastener Finish: Black oxide Washers Included: Yes Pro series cylinder head studs from ARP are cold forged to ensure molecular integrity. They are heat treated prior to thread rolling and machining and are rated at a whopping 220,000 psi. ARP Pro series kits are also available with 12 point nuts, and all kits come complete with hardened parallel washers for an