These mobile bin racks are made from 12 ga hangers and 4 in channel uprights. The bin contents are visible and easily accessible. These are ideal for organizing small parts in shops, factory assembly areas, parts departments and maintenance tool cribs. The bins are 8-1/4 in W x 14-3/4 in D x 7 in H and can hold 60 lb each. The 2 x 6 in casters make moving this rack around the shop easy.