7/16 Inch - 20 Thread Size0.750 Inch Under Head Length12 Point Bolts with Hex Head Nuts and WashersSuper Strong, Rated At 200,000 PSIWith GM Pwrglide, TH350, TH400; Race Convtrs w-1/2 in TabsYou can forget about the problem of shearing a torque converter bolt after you install these super strong 200,000 PSI gems. They are designed for each specific application and provide the optimum grip. Kits come with hardened parallel ground washers.