Flexplate Bolt Kit by ARP These Pro series flywheel bolts from ARP give you all that you need to bolt in your flywheel with confidence. They\’re much stronger than OEM hardware, are forged from aerospace alloy, and are heat-treated prior to thread rolling and machining. These bolts feature an exclusive, flat 12-point head design and a larger-than-stock shank diameter for increased strength and improved flywheel register. Features Fastener Material: Steel Fastener Finish: Black oxide Fastener Head Style: 12-point Thread Size: 1/2 in.-20 Underhead Length (in.): 0.675 in. Fastener Tensile Strength (psi): 200,000 psi Washers Included: No Benefits Much stronger than OEM hardware Forged from aerospace alloy Heat-treated prior to thread rolling and machining Applications 1959 – 1971 Pontiac Bonneville 1959 – 1971 Pontiac Catalina 1967 – 1970 Pontiac Executive 1967 – 1979 Pontiac Firebird 1973 – 1975 Pontiac Grand Am 1962 – 1971 Pontiac Grand Prix 1964 – 1971 Pontiac GTO 1963 – 1971, 1975 – 1977 Pontiac LeMans 1977 Pontiac Phoenix 1959 – 1966 Pontiac Star Chief 1961, 1963-1970 Pontiac Tempest 1971 – 1977 Pontiac Ventura What\’s In The Box? 6 – Bolts Warranty Manufacturers Standard Warranty