The Costco version of these heavy duty metal shelves:
“3-tier steel wire deck industrial rack was designed and engineered to provide heavy-duty storage options. Three adjustable wire grid shelves can support up to 1,500 lbs. per shelf with the weights evenly distributed. The product is made from powder-coated steel for corrosion resistance. The shelves are adjustable in 2-1/2-in increments to accommodate your storage needs.”