Mdf Anti-tipping Over: An anti-tipping over unit is provided for this storage shelf for extra stability and safety. You can fix this rack to the wall next to it Changeable Design: Featuring the height-adjustable design, this storage shelving unit can be built as you need, vertically or horizontally. Or, you can remove the board to get bigger space for large items Powder-coated Iron Frame: The powder-coated metal surface of this multi-layer storage unit is tough and smooth to resist slight scratches and water Wide Use: This 5-tier storage rack includes 16pcs plastic feet to be put together into a shelving unit or a horizontal workbench. The frame is applicable but not limited to the basement, storage, home, bedroom, living room, kitchen, etc Boltless Assembly: The boltless design allows a low technical-required assembly. All the necessary mountings, detailed instructions, and a pair of gloves are accompanied. That 2 people work together is suggested. A rubber mallet will also be very helpful (rubber mallet not included)