Industrial wire shelving supports up to 1,000 lb. per shelf (evenly distributed) Shelving is made of steel with a powder coat finish, 10-gauge shelf surface, 3-gauge frame, and 6-gauge wave pattern. Each shelf adjusts in 1in. increments. Easy collar-and-sleeve assembly requires no tools. Units can be expanded with the use of add-on units and extra shelves (each sold separately). Add-on unit includes 4 shelves and 2 posts. Made by Lorell.