This Edsal shelving unit is made of steel for sturdiness. The black finish is resistant to corrosion. It features five adjustable shelves made of wire supported by beams and side braces for strength. Each shelf can hold 1,000 lbs of weight when the weight is evenly distributed across the shelf. The wire shelves adjust in increments of 1.5-in. The shelves can be installed with beams and brace edges facing down for a flat storage surface or facing up to create a tray.