This Prime-Line N 7065 Pocket Door Roller Assembly is constructed of a steel bracket and ball bearings with plastic tires. The bracket’s hole center spacing measures 1-7/8 inch and it features 2 parallel wheels that are spaced apart at 3/4 inch on center. The wheels are constructed of durable plastic which provide for a smooth, long-lasting, quiet operation, and they feature 13/16 inch diameter convex (round) edges. These adjustable roller assemblies mount on the tops of pocket doors, and they are used by Kenna-frame, Crawford, Press-Rite Doors, and many other pocket door manufacturers. These roller assemblies have a maximum safe load capacity of 100 pounds. This roller assembly fits into a 1 inch wide track (inside dimension, wall-to-wall).