Prime-Line Products N 7410 Pocket Door Roller Assembly, 1 in., Convex, Plastic Tires, Steel Bracket Used as a top roller assembly on pocket door systems 1 in. outside diameter wheels Convex edge wheels (round edge) Constructed 4 of plastic wheels assembled to a steel bracket Four 1 in. nylon wheels Adjustable steel bracket Top mount design Fits 1-3/16 in. double J-style track systems