This is a side mounted, top hung wardrobe roller assembly with a single 7/8 in. convex nylon wheel for the back sliding door. The stamped steel bracket assembly is adjustable and has an 1/2 in. offset. It is fitted onto the wardrobe front door and fits 3/4 in. to 1-3/8 in. thick doors. Used by Cox door systems as well as a variety of other wardrobe door manufacturers. For the back wardrobe door see Prime-Line part N 6505.