Mr. Gasket Torque Converter to Flex Plate Bolts are forged from high quality steel and heat-treated for extra strength, these Grade 8 fasteners are a must for all hi-performance applications. Black plated finish helps resist rust and corrosion. Kits are complete with lock washers, where needed. Application: GM TH400 3/8-16 x 1/2 inch 3 per set.