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.): 0.940 in. Fastener Tensile Strength (psi): 200,000 psi Washer Included: Yes Fastener Material: Chromoly Fastener Finish: Black oxide Benefits Forged from premium-grade 8740 chromoly steel Heat-treated to a rating of 200,000 psi Applications 1986 – 2014 Ford Mustang 1982 – 2012 Ford F-150 1982 – 1996 Ford Bronco 2001 – 2005 Ford Explorer Sport Trac 1991 – 2011 Ford Ranger 4.0L models 1991 – 2001 Ford Explorer (Solid axle) 1985 – 2011 Ford Panther platform vehicles 2012 – Present Ford F-150 (Super 8.8, depending on engine and other options) What\’s In The Box? 10 – Bolts Warranty Manufacturers Standard Warranty