AmGood Double OverShelf Stainless Steel NSF - Many (48" Long x 12" Deep) Double tier overshelf is mounted on top of a work table which allows to significantly maximize the available space of your kitchen. Heavy duty durable construction allows for many years of use in a commercial environment. Made with 18 gauge stainless steel to resist corrosion. NSF Certified. Lower shelf is fully adjustable. Double tier over-shelf ships knocked down and can be easily installed in 10 minutes.