Prime-Line N 7065 Pocket Door Roller Assembly, 13/16 in., Convex, Plastic Tires, Steel Bracket & Ball Bearings Used as a top roller assembly on pocket door systems 13/16 in. outside diameter wheels Convex edge wheels (round edge) Constructed of 2 plastic wheels with steel ball bearings, assembled to a steel bracket Fits 3/4in. center to center double " J " track Used on Pocket doors Fits Kenna-Frame, Crawford and Press-Rite doors