2 Pack, Door Roller Assembly, 7/8 in., Convex, Plastic Tires, Steel Bracket. 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 in. x 1 in. and it features 4 parallel wheels that are spaced apart at 7/8 in. on center. The wheels are constructed of durable plastic which provide for a smooth, long-lasting, quiet operation, and they feature 7/8 in. diameter convex edges. These adjustable roller assemblies mount on the tops of pocket doors, and they are used by a variety of pocket door manufacturers. This roller assembly fits into a 1-5/16 in. wide track (inside dimension, wall-2-wall).