The Middle Atlantic SS sliding shelf is both functional and rugged. It slides on ball bearings and extends a full 13 inches. The shelf mounts to any rack (rear rackrail required in steel racks) and occupies slightly more than a single rackspace. It has a high 50 lb. Weight capacity, rugged ball bearing slides, and an adjustable rear support that allows mounting in most racks (within a range of 15.1 inches to 23.9 inches). This shelf is constructed from steel with a black powder coat finish.