HEAVY DUTY CONSTRUCTION: Built with 25.4mm thick carbon steel tubes and reinforced support rods, each shelf holds up to 660 lbs — 5 tiers combined support up to 3300 lbs. Far stronger than thin wire shelving, our Garvee wire shelving rack will not bend or warp under heavy loads, making it ideal for professional garage and warehouse storage. CARBON STEEL SHELVING UNIT: Unlike many shelving units that use cheap particle board or MDF shelves prone to damp rot and water damage, this metal shelving unit features all-steel carbon metal shelves. The powder-coated finish resists rust, scratches, and corrosion, making it perfect for humid basements, garages, and commercial environments. Easy to clean with a simple wipe. ADJUSTABLE SHELF HEIGHT & SPACIOUS DESIGN: Each of the 5 shelves can be adjuste.