Prime-Line N 7449 Door Roller Assembly 2-PK 7/8'' Dia. x 2-7/16'' L Mill Hardware Included: Yes;Packaging Type: Carded;Compatibility: Bypass and Pocket doors;Number in Package: 1 pk;Product Type: Roller;Material: Plastic/Steel;Finish: Mill;Diameter: 7/8 in.;Length: 2-7/16 in.;Brand Name: Prime-Line; DOOR ROLLER ASSEMBLY ? The Prime-Line N 7449 Bi-Fold Door Roller Assembly is constructed of a steel bracket and ball bearings with plastic tires; It can be commonly used on pocket door and by-pass sliding door systems DURABLE ? The wheels are constructed of durable plastic which provide for a smooth, long-lasting, quiet operation, and they feature 7/8 inch diameter convex (rounded) edges POCKET DOORS ? These adjustable roller assemblies mount on the tops of pocket doors; and they are used by a variety of pocket door manufacturers TRACK SIZE ? This roller assembly fits into a 1-5/16 inch wide track (inside dimension, wall-2-wall). 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