Adding onto an existing unit for more storage space or arranging with any of ourpoststo form a solution that supports your needs, our individually-sold 21"d Chrome Wire Shelves offer flexibility. Sturdy chrome-plated steel construction Open-wire design permits airflow to reduce dust and dirt accumulation Adjustable in 1" increments on posts 21-48"w shelves hold up to 800 lbs of evenly distributed weight 60"w and 72"w shelves hold up to 500 lbs of evenly distributed weight Made for indoor use, dry storage only Use with (4)poststo create custom chrome wire shelving To securely set or quickly remove shelves, tap their corners with arubber mallet. View ourWire Shelving Size Guidefor actual outer and inner dimensions to see if these shelves will fit with your existing system.