For 3/4'' or 1-3/8'' doors up to 50 lb. Track is precision rolled heavy steel 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. No. 1166G482: Opening size 48'' No. 1166G602: Opening size 60'' No. 1166G722: Opening size 72''