Super Quality Material: This box rail track is made of galvanized steel, prevents bend or deform. Designed for barn doors that are used outdoors and can withstand bad weather. Galvanized steel floor guide add strength, with adjustable roller secures door in place. Dimensions: Hold MAX door weight 450lbs. Suitable for door panel thickness: 1-3/8" to 1-3/4". Maximum door width: 36". You can connect 2 sets of hardware to apply for 72'' door openings. Easy to Install: Come with detailed installation manual and nessecery parts, you can easily install this barn door hardware kit within 30 minutes. Package Included: Package Included: 2x 3" Track, 2x Track end caps, 2x Hangers with door strap,1x floor guide, 5x Track brackets, 2x Stoppers and detailed installation manual. QUALITY SERVICE: BARNSMITH has a professional customer support team. If you encounter any questions or troubles, please let us know. We will be happy to solve them in time. Sliding Barn Door Hardware Kit