Inner Row M8 bolts not included. Head Style: 12-Point Nuts. Fastener Finish: Black Oxide. ARP Pro Series Cylinder Head Studs. ARP Pro Series cylinder head studs are cold-forged to ensure molecular integrity. They’re heat-treated prior to thread rolling and machining. ARP Pro Series kits are also available with 12-point nuts, and all studs come complete with hardened parallel washers for an even load distribution and accurate torque readings. You’re already purchasing the item. With our dynamic pricing model, our prices are always competitive. Our prices are some of the lowest that you will find on the internet. Rest assured that you’re getting a good deal when purchasing with us.