1.[HEAVY-DUTY CARBON STEEL CONSTRUCTION]:High-quality STEEL PLATE FRAME featuring rust-resistance, the laminate is made of environmentally friendly MDF BOARD . These storage shelves feature exceptionally secure wire racks, The storage shelf is extremely stable and durable for storage. 2.[ADJUSTABLE HEIGHT]: The dimension of the boltless shelf is 168 cm (H) x 75 cm (L) x 30 cm (W)/66.1'x29.5'x11.8' with 5 levels. The height of each shelf is adjustable from 0mm to 38mm. You can easily adjust the layout to your needs and space such as a high shelf or two low shelves. 3.[EASY TO INSTALL]: Assembly has never been easier - no nuts and bolts. The plug - in system made of metal shelf enables quick and easy installation. 4.[STABLE LEVELING FEET]: Each shelf holds up to 386- lbs with leveling feet, The total max weight with leveling feet is 1930lbs.Specially add anti-slip feet, Its steady and secure placement guarantees a strong and long - lasting shelf rack, even on uneven ground without damaging the floor.