Adjustable height: This shelf has five tiers, and you will get 2 pieces of shelves totally. The height of each tier can be adjusted to meet your different needs. The shelves can be adjusted to a small distance to place small items, or you can remove the divider to form a large space for big items. Boltless design for the easy assemble: The storage racks are easy to build, and all of the necessary mountings and instruction are accompanied. A rubber mallet is recommended for assembly. (A rubber mallet not included; include a pair of glove for your convenience). Sturdy metal & MDF boards: This storage rack is constructed of high-quality steel and durable MDF boards. Its steel frame structure holds the MDF board more firmly for providing extra stability. Multiple uses: Each 5-tier storage rack includes 16pcs plastic feet, 32pcs in total. So, you can build it as a shelving unit or horizontal as a long workbench. The good racks are versatile for basement, storage, workshop, shop, home, bedroom, living room, kitchen, etc.