ARP 247-4202 Pro Series Cylinder Head Studs Kit for Dodge Cummins Diesel 5.9L 6.7L 24VFastener Style: Stud Undercut Stud: No Head Style: 12 point Fastener Material: ARP2000 Fastener Finish: Black oxide Washers Included: Yes Cut to Fit: No Quantity: Sold as a kit. Notes: Fits 24 valve engines. 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,