-Top unit pivots for proper angle -Slotted for vertical adjustment -Heavy gauge steel construction with non-slip dimples Top unit pivots for proper angle of flat-mounted bunk or bolsterboards. Slotted for vertical adjustment. Heavy gauge steel with non-slip dimples for better hold. Assembled. Width - 2-1/2''. Holes - 13/32'' - 2-1/2'' on center. Galvanized finish.