Designed to be used in conjunction with an 18"d x 30"w four-shelf starter unit, our add-on wire shelving allows for the expansion of storage space. By sharing a set of posts, the two solutions can be configured at a right angle (L-shape) or in a straight line. Attaches to existing chrome wire shelving starter unit to extend length of shelves Sturdy chrome-plated steel construction 800 lb capacity per shelf, evenly distributed Made for indoor use, dry storage only S-Hook 2-Packrequired per extra shelf To securely set or quickly remove shelves, tap their corners with arubber mallet. View ourWire Shelving Size Guideto see actual outer and inner dimensions.