[SUPERIOR QUALITY]: The bifold door hardware kit is made of high quality Carbon Steel with frosted black surface, rust resistance, durable, can maintain its beauty and longevity for many years. [TRACK SIZE RECOMMEND]: The track should be more than 150 mm (6") longer than the door opening. Each door panel width =(door opening width+100mm(4’’))/8. Fit Door Thickness: 1.18''-1.77''. Weight Capacity:330lb. [STABLE AND EASY INSTALL]: Carbon Steel Hangers with premium nylon pulley, makes the system slides like butter.Step-by-step installation manual and online install video help you finish the installation freely. [PACKAGE INCLUED]: 1*spliced track, 6*hangers, 2 rotating shaft, 18*hinges and all needed accessories. Step-by-Step Instruction. ONLY HARDWARE FOR SALE, DOOR NOT INCLUDED. [SUPPORT]: We are the manufacturer of barn door hardware. If any questions or problems before and after your purchase, pls feel free to contact us. Bi-folding barn door hardware kit for 8 bifold screen doors.Two side opened.(Hardware Kit Only, Do Not Include Doors)