Heavy 11 gauge galvanized steel that is slotted for vertical adjustment. Non-slip dimples for secure hold. Angle bracket pivots for angled or flat mounting of 2" x 6" (5.08cm x 15.24cm) bunk or bolster boards. Complete with nut and bolt for angle bracket. Mounts with 1/2" (1.27cm) bolt. Bracket angle 3.5" W (8.89cm). Standard carton 12 bulk.