Center Swivel Bracket - 2-1/2Galvanized swivel top bracket provides vertical and tilting adjustment for trailer bunks. Swivel Bracket for mounting Bunk Boards to Bolster Brackets. Features:Bolt-on installationBunk flange holes 3/8 dia.Bunk flange 1-3/8 x 3-1/2Swivel flange hole 1/2 dia.Swivel flange 2 tall x 3-1/22-1/2 bunk flange hole centers11 gauge galvanized steelMade in the USASold individually