With its low profile, our 21"d 1-tier chrome wire shelving conveniently creates additional storage in underutilized areas. Great for organizing frequently used items in cabinets and on countertops. 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 Shelf adjusts in 1" intervals on 6"h posts Made for indoor use, dry storage only To securely set or quickly remove the shelf, tap its corners with arubber mallet. View ourWire Shelving Size Guideto see actual outer and inner dimensions.