Prime-Line 3/4 Inch Ball Bearing Roller Wardrobe Door Roller Assembly (Back) 2-Pack N 6517This is a side mount, top hung adjustable roller bracket with a 3 4 in. ball bearing convex nylon roller and 1 2 in. offset that fits onto the back wardrobe door panel. It fits 3 4 in. to 1 3 8 in. thick doors. Used by a variety of by pass door manufacturers Used on the back door of a by pass system 1 2 in. offset and 3 4 in. diameter roller Stamped steel bracket and convex nylon roller 2 pack Mounting hardware included A Phillips head screwdriver is