Chrome Barrel Bolt - 4". Features:. Chrome Plated Bronze Body & High Impact Black Nylon Bulkhead Keeper. 3/8" Diameter Bolt. Bulkhead Keeper Easily Installs in a 5/8" Hole. Includes Friction Pad to Eliminate Rattle and Provide Smooth Operation. Overall Dimensions: 4-5/16" x 1-7/16"