Center Swivel Bracket – 2-1/2″Galvanized 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 3-1/2″Swivel flange hole 1/2″ dia.Swivel flange 2″ tall x 3-1/2″2-1/2″ bunk flange hole centers11 gauge galvanized steelMade in the USASold individually