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:1/2 in.-20 Underhead Length (in.):1.065 in. Fastener Tensile Strength (psi):200,000 psi Washer Included:Yes Wrench Diameter:9/16 in. Fastener Material:Chromoly Fastener Finish:Black oxide Benefits Forged from premium-grade 8740 chromoly steel Heat-treated to a rating of 200,000 psi Please Note: Fasteners designed for Tru-Trac ring gears Applications Universal What\’s In The Box? 10 – Bolts Warranty Manufacturers Standard Warranty