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These Caster Trays are designed to conveniently mount larger Wall Mount Enclosures on the floor, making them mobile to move in any location required. They are designed with locking casters, available in two sizes; 20″ for 5U-16U Wallmount Enclosures, and in 28″ for 20U-28U Wallmount Enclosures; they are constructed of cold rolled steel, and come in a black powdercoat microfinish.