The Middle Atlantic RIB-3-MRK-31 is a 2.5" (63 mm) riser base that can accommodate three MRK series 31" (787 mm) deep racks. Use this riser base for field rough-in prior to arrival of racks and enclosures. For advanced cable management, it has laser knockouts on its both sides for passing the cables.
This riser base is phosphate pre-treated with black powder coat finish. Its structure uses 11-gauge steel with 0.12" (3.2 mm) thick fully welded construction.