SUPERIOR QUALITY: We specialized in sliding door and hardware for many years. Our barn door hardware is made of high quality carbon steel . There is no need to worry about quality. You get what you pay for. DOOR WEIGHT CAPACITY:220 lb (100kg), fit door panel width: 32' (83cm), door thick 1-3/8'' to 1-3/4'' (3.5cm-4.5cm).The track kit comes with 2 kinds of wall fastener,1 for wood wall, 1 for concrete wall. All nylon wheels have been tested beyond 100,000 rolls. PACKAGE INCLUDED: 2x 2.75FT Rails, 5x Rail Spacers, 2x Rollers, 2x Door Stops, 1x Floor Guide, 1x Hex Key; All other necessary hardware is included as you see in the pictures. （DOOR NOT INCLUDED.）. VERY DETAILED INSTALLATION STEPS:We provide step-by-step graphic and text instruction. It is very easy for you to take a reference during the installation. SUPPORT: We are the manufacture of barn door hardware. We have a professional engineer team. If there is question or problem, pls feel free to contact us.We will try our best to serve you.