This is a single wheel; top hung, side mounted adjustable roller bracket with a 1 in. convex nylon roller that fits onto the back wardrobe door panel. The stamped steel adjustable bracket has a 1-1/8 in. offset and fits onto a 3/4 in. to 1-3/8 in. thick door. Primarily used on Cox door systems, it may also be found on a variety of other wardrobe door manufacturer's doors. For other offsets use Prime-Line parts N 6513 and N 6515.