ARP 4303102 Stainless 300 Hex Motor Mount Bolt Kit Add ARP's legendary quality to secure your engine with complete confidence Manufactured from polished Stainless 300 steel, a proprietary alloy that is impervious to rust and corrosion Rated at 170,000 PSI, which is considerably stronger than Grade 8 hardware Bolts feature conventional hex style heads Kit comes complete with high quality flat washers