The Edelbrock Intake Manifold Bolt Kits are designed specifically to work with the Edelbrock manifolds, including the Performer, Performer RPM and Torker Series. They feature external hex heads for easy wrench access, an attractive cadmium finish for corrosion resistance and hardened washers. All bolts and washers needed for manifold installation are included in these kits. The thread size of this bolt is 3/8-16.