Prime-Line Products D 1733 Sliding Door Roller Assembly with 1-1/4-Inch Nylon Ball Bearing 1-1/4in. O.D. Nylon ball bearing center grooved roller Housing dimensions: W: 11/16in. L: 2-5/16in. H: 1-3/16in. Overall thickness: 7/8in. Adjustable steel housing assembly Fits Northrop and other glass door manufacturers