Proslat 63020 ProRack Heavy Duty Secondary Shelf, Charcoal Granite, 48" x 28" Double the storage capacity for your ProRack with additional shelving for over 9 sq ft more space, to hold totes, coolers, luggage, bulky tools & more High-load bearing steel, powder coated in charcoal granite finish for years of durability Heavy duty reinforced steel grid shelf Add over 18 cubic feet of storage to your ProRack Supports up to 350 lbs. when installed to Proslat ProRack, total weight capacity 800 lbs when installed directly to studs