51 9/16″ Bifold Sliding Barn Door Hardware, White Flat Rail Top Mounting Roller, Fit 12″ Door Panel, 4 Doors kit, No Door. Hardware only, not including door panel The folding door kit is made of high-quality carbon steel with white finish, which ensures that the product is corrosion-resistant, waterproof, fireproof, rust proof, durable, and maintains many years of beauty and service life Track size = door opening + 6″ or more For example, if your door opening is 60″ long, the required track length is 60″ + 6″ Hardware fit door panel thickness 1 3/8″ 1 3/4″, The distance from top of the door to the top of the roller is 5 7/8″, please leave at least 7″ for installation Full set of hardware included;1track, 4wall spacer, 4wheel, 4suspension wheel bracket, 2stopper, 2floor guide, 1hexagon wrench, 6hinge, 2seal, 1 Pack screws.