RMP Stainless Steel Shelf Brackets ar heavyweight and can support up to 300 pounds. Eight 0.281 inch diameter pre-drilled holes allow for easy installation. The shelf bracket is made form 11 gauge stainless steel and comes with a PVC coating that easily peels away to reveal a shiny, luster finish. The #4 finish of the product's material has a polished, grain finish appearance. Stainless steel brackets will not tarnish or oxidise and are suitable for indoor or outdoor use. They come as a two piece set.