Prime-Line N 7410 Door Roller, 1 in Dia Roller, Top Mounting, Steel

N 7410 is a four wheeled pocket door roller assembly used on a double track that has a 1-5/8 in inside width with a 1-3/16 in center to center measurement. The four 1 in Dia nylon convex rollers provide a smooth, long-lasting, quiet operation and are affixed to an adjustable stamped steel housing that slides into a stamped steel mounting bracket. Used on a 1-3/8 in thick door and 80 lb.