Hyper Tough 4 Tier Wire Shelf Unit is ideal for home and commercial use. It has strong and durable welded wire construction. Open wire design allows air circulation and reduces dust build-up. NSF certified for dry environment. Shelves can be adjusted in 1" increments. Each shelf can holds up to 600 lb evenly distributed when assembled with feet levelers. Total weight capacity when assembled with casters is 500 lbs (125 lbs per shelf). This wire shelving system also includes 4pcs plastic shelf liners. It can provide a smoother surface for your wire shelves and prevent smaller items from falling through. It is designed for adult use. This wire shelving system is perfect for homes, offices and any other places you need to organize.