Durable welded wire construction with open design permits sprinkler, air and light penetration and reduces dust build-up. Shelves are adjustable in 1 in. increments. Includes four 3 in. PVC casters for easy mobility and four leg levelers to use as stationary shelving. Maximum weight capacity per shelf is 400 lbs. evenly distributed without casters and 495 lbs. unit weight capacity with casters installed.