This high-quality storage shelf is constructed of a galvanized metal plate. This 4-tier shelving unit can be used separately or combined with other shelves into a larger storage space to meet your various needs. Its boltless design allows it to be easily assembled and disassembled. This storage rack can be disassembled into a compact size for easy storing and transporting. It is an ideal storing and displaying solution in kitchens, garages, workshops, warehouses, and balconies.