ARP 5559502 Engine And Accessory 12-Point Fastener Kit, Polished Stainless Steel, For Select Ford 360-390-428 CID, FE Series, Big Block Applications Contains 12 groups of fasteners, virtually everything you need to assemble a show-quality carbureted engine All neatly organized and labeled in protective vacuum-wrapped packages Manufactured from polished Stainless 300 steel, a proprietary alloy that is impervious to rust and corrosion Heads are compact 12-point style, and premium-quality washers are included Rated at 170,000 PSI, which is considerably stronger than Grade 8 hardware