This is a Heavy Duty Version of a Swivel Top Bunk Bracket. This Hot-Dipped Galvanized Swivel Top Bunk Bracket Can Easily replace rusted out Swivel Tops on your Bunk Brackets. These Heavy Duty Swivel Tops are meant for mounting 2 inch by 4 inch Bunk Boards at a specified angle to support the hull of your boat. This Heavy Duty Hot-Dipped Galvanized Swivel Top Bunk Bracket is made of 3/16 inch steel, measures 3 1/2 inches long x 2 inches (side with 1 hole) x 1 1/4 inches (side with 2 holes). The Top holes measure 2 1/2 inches center to center.