The ClosetMaid ShelfTrack Standard is exclusively designed to work with the ShelfTrack hang track and standard system. It gives you great versatility in your storage design, allowing you to move and adjust the wire shelves to any height. Durable metal construction and a double-slotted design provide strength and durability. Set no more than 24 in. apart and no more than 4 in. from the end of a shelf for stability.