For 3/4" or 1 3/8" doors up to 50 lb. Track is heavy extruded aluminum with convex rails. Hangers are heavy gauge steel with zinc plating, and in reverse positions will accommodate both 3/4" or 1 3/8" doors. Wheels are 7/8" diameter, molded from nylon and machined for size, smoothness and balance. Adjustable door guide is woodtone finished steel with woodtone nylon floating guides. Pulls are 3/4" diameter, brass plated. 2 door kit.