This is a side mounted， top hung wardrobe roller assembly with a tandem 7/8 in. convex nylon wheel for the front sliding wardrobe door. The stamped steel bracket assembly is adjustable and has an 1/4 in. offset. It is fitted onto the wardrobe front door and fits 3/4 in. to 1-3/8 in. thick doors. Used by Acme and Stanley door systems， as well as a variety of other wardrobe door manufacturers. For the back wardrobe door roller assembly use Prime-Line part N 6503.Find the ROLLR WRDRB DR 1/4 CD2 at Ace.