Dimensions: 48W x 18D x 72H in.. Made from strong solid steel. Select from available colors. Shelves able to adjust in 1 in. increments. Can be set up as one 4-tier rack or as two 2-tier racks to fit specific needs. Organize your tools, supplies, or wardrobe with help from the Alera Industrial 4 Shelf Heavy-Duty Wire Shelving Starter Kit - 48W x 18D x 72H in.. This wide and tall shelving unit is an excellent addition to any home, offering modular, easy-to-assemble storage. The shelving unit can be built up as a four-tier unit or a pair of two-tier units to better suit your needs. Long-lasting steel supports the frame, outfitted with wire shelves. The shelves are adjustable in height for your convenience. Your choice of available color. Color: Black.