Need a dependable, durable storage solution for an area with a limited amount of vertical space? Low in height, our 21"d 2-tier chrome wire shelving keeps items organized in those tight spots where taller units won't fit. This product cannot be stacked. For taller shelving, please see our3-shelf,4-shelf, and5-shelfunits. Constructed of chrome-plated steel Open design reduces dust accumulation 21-48"w shelves hold up to 800 lbs, evenly distributed 60/72"w shelves hold up to 500 lbs, evenly distributed Made for indoor use, dry storage only To securely set and easily release shelves, tap their corners with arubber mallet. View ourWire Shelving Size Guideto see actual outer and inner dimensions.