This roller assembly is constructed of a steel bracket and ball bearings with plastic tires. It can commonly used on pocket door and by-pass sliding door systems. The bracket's mounting base measures 2-7/16 inch x 1 inch and it features 4 parallel wheels that are spaced apart at 7/8 inch on center. The wheels are constructed of durable plastic which provide for a smooth, long-lasting, quiet operation, and they feature 7/8 inch diameter convex edges. These adjustable roller assemblies mount on the tops of pocket doors, and they are used by many pocket door manufacturers. This roller assembly fits into a 1-5/16 inch wide track.