60 Bifold Door Hardware, Folding Door Hardware Sliding Barn 5FT for 4 doors. Upgraded Hanger:3-wheel door hangers all wheels carry door weight equally, with durabe ball bearing rollers to ensure minimum friction and smooth, quiet operation. Product Dimensions:Track length:60, Max door weight: up to 75 lb per panel. Fit door thickness: 1-3/8″ [35mm] to 1-3/4″ [45mm]. The length of the track can be customized with a right tool. High-quality Aluminum Materials: Precision extruded aluminum box track ensures door will not jump from track, convex rails on track allow flexible and free rolling. Box-shaped design protects track from dust and dirt. Package Included:Aluminum Track x 1, Top Pivot Set x 2, 3-wheel ball-bearing Hanger x 2, Panel Hinges x 6, Bottom Pivot Set x 2, Track Stop x 2, Door Knob x 2, Panel Aligners (4 door sets only) x 2, Wrench & Instructions x 1. Suitable for 4-panels door. Service: We are reliable and qualified manufacture. Professional customer service team help you solve all problems in time.