These AED Holley fuel bowl bolts are perfect for installing new fuel bowls or replacing old, worn bolts. They have 5/16 in. hex heads and come with reusable bowl bolt gaskets. They fit Holley 4150 and 4160 carburetors. Features: Fuel Bowl Bolt Head Type - External Hex. Fuel Bowl Bolt Material: Steel. Fuel Bowl Bolt Finish: Iridescent Gold. Package - 8. Brand - Holley, Model - 4150