The pre-assembled storage rack features a frame that simplifies the assembly process, allowing you to attach the wheels in just a few simple steps for easy setup. This versatile 4-tier shelving unit offers extensive storage possibilities, making it ideal for organizing tools in the garage, kitchen supplies, or daily items in the living room and study. Equipped with 4 smooth rolling casters, two of which have brakes, the rack can be moved effortlessly and secured firmly in place when needed. Constructed with a rugged metal frame, the storage shelf is sturdy and stable, supporting up to 135 lbs, and includes an anti-toppling device to protect stored items. The space-saving design allows the 4-tier rack to be folded flat when not in use, with folded dimensions of 13.5" x 3.5" x 49.5" (L x W x H) and unfolded dimensions of 28" x 13.5" x 49.5" (L x W x H). The height between shelves measures 14.5", 13.5", and 13.5", and the net weight is 19.5 lbs. The storage rack comes in black metal and is packaged in one box (may vary by batch).