... durable adjustable steel shelving storage rack shelving Medium-Duty adjustable steel shelving storage rack shelves ♣ This kind of rack is the articulated structure ... can be freely adjusted the distance of 50mm or 75mm for the layer height;♣ Reasonable structure, strong and durable, ... row holes, 50mm distance, arranged by a straight line for articulating beams. The uprights slice is composed by two ...