Fully adjustable rollers ensuring smooth and safe sliding.It can be used with 3inch thickness doors, suitable for all brands of barn door.Easy for installation, fix 2 screws on the floor bottom plate, adjust and tighten.Integrated bearing provides ultra-smooth, easy-to-use gear.Carbon steel frame with black surface, matching screw for maximum durability.Product DescriptionFeatures:1. fully adjustable rollers ensuring smoothand safely sliding.2. It can be used with 3inch thick doors,suitable for all barn door brands.3. Easy to install, fix 2 screws on thethe floor bottom plate, adjust and tighten.4. integrated bearing provides ultra smoothbearing, convenient to use.5. Carbon steel frame with black surface, screwsmatching for maximum durability.Features:Material: carbon steelThe color blackType Optional: Compactor roller, double roller,Single Heighten RollSuitable: 76mm / 3in thickness sliding doorSize: 115*50*65*5MMPackageList:1 * Floor Guide1 * Bag of screws AccessoriesNote:1. Please allow 1-3mm error due to manual measurement.Thanksfor your understanding.2. monitors are not calibrated same, item color displayed inphotos may be showing slightly different from the real object.Please take the real thing as standard.