4-tier storage shelves are height adjustable, we can decide the height of the wire shelving unit according to the height of the placed items. Enjoy the option for a completely customizable metal shelving unit. Giving you the freedom to adjust accordingly to your needs. The metal shelves are made of strong welded wire construction have excellent rust resistance, and oxidation, and provide exceptional strength, and stability. No assembly tool is needed, it can be assembled freely, and snap-together design assembles in minutes. The storage shelves provide an enormous amount of space for you. Open design allows you to quickly fetch the one you want.