Ring Gear Bolt Kit by ARP ARP Pro series ring gear bolts are forged from premium-grade 8740 chromoly steel and heat-treated to a rating of 200,000 psi. Specially hardened, precision-ground washers are also included, where required. Features Head Style: 12-point Thread Size: 7/16 in.-20 Underhead Length (in.): 1.200 in. Fastener Tensile Strength (psi): 200,000 psi Washer Included: No Fastener Material: 8740 chromoly Fastener Finish: Black oxide Benefits Forged from premium-grade 8740 chromoly steel Heat-treated to a rating of 200,000 psi Applications 1966-1996 Ford Bronco 1992-2011 Ford Crown Victoria 1997-2009 Ford Expedition 1991-2010 Ford Explorer 1957-1983 Ford F-100 1975-2012 Ford F-150 1957-1970 Ford Fairlane 1970 Ford Falcon 1991 Ford LTD 1964-1973, 1979-2017 Ford Mustang 1964-1978 Ford Ranchero 1983-2011 Ford Ranger 1957-1971, 1980-1997 Ford Thunderbird 1968-1976 Ford Torino 1967 – 1973, 1980 – 1997 Mercury Cougar What\’s In The Box? 10 – Bolts Warranty Manufacturers Standard Warranty