Help ensure the proper sealing of your vehicle's valve cover by using ARP's professional quality valve cover bolts. To maintain a reputation for "zero defects", ensure optimum quality control, and produce fasteners of exceptionally high quality, ARP controls all aspects of the manufacturing process, performing all operations in-house where they can be closely monitored. ARP takes extraordinary steps to produce the very finest products of their kind on the market today. These bolts are manufactured from polished Stainless 300 steel, a proprietary alloy that is impervious to rust and corrosion, and feature traditional hex style heads. Each bolt is size 1/4-20 with an under head length of .515, and the set of 8 bolts comes complete with premium-quality washers.