ARP Head Bolt Kits | Multiple Chevrolet Fitments (234-4727)Head Stud Kit by ARP ARP stainless steel cylinder head bolts are 15 percent stronger than Grade 8 steel. They have a compact head that will allow a socket to fit into those tight, tricky spaces. These bolts are both highly corrosion and heat resistant, feature a polished finish, and come in 12 point and hex style heads. Features Fastener Style: Bolt Undercut Stud: No Head Style: 12 point Fastener Material: 8740 chromoly Fastener Finish: Black oxide