NSF Certified. Strong and durable welded wire construction with open design permits sprinkler, air and light penetration and reduces dust build-up. Includes five shelves adjustable in 1" increments. Four 3" rubber casters, 2 with locking brakes. Also includes adjustable leveling feet. Units are easy to assemble in just minutes without tools. Maximum weight capacity per shelf is 500 lbs., evenly distributed. Chrome-plated finish.