Add this shelf to an existing 18"d chrome wire shelving unit to increase storage space. Each of our chrome wire shelves are made with the same quality and structural integrity, from 18"w to 72"w. Offers greater visibility of items Open-wire design maximizes airflow, reducing dust and dirt accumulation Can be adjusted to any desired height in 1" increments along posts 18-54"w shelves hold up to 800 lbs, evenly distributed 60"w and 72"w shelves hold up to 500 lbs, evenly distributed Made for indoor use, dry storage only Use with 4Chrome Wire Shelving Poststo create custom 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.