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 Description Features: 1. fully adjustable rollers ensuring smooth and 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 the the floor bottom plate, adjust and tighten. 4. integrated bearing provides ultra smooth bearing, convenient to use. 5. Carbon steel frame with black surface, screws matching for maximum durability. Features: Material: carbon steel The color black Type Optional: Compactor roller, double roller, Single Heighten Roll Suitable: 76mm / 3in thickness sliding door Size: 115*50*65*5MM Package List: 1 * Floor Guide 1 * Bag of screws Accessories Note: 1. Please allow 1-3mm error due to manual measurement.Thanks for your understanding. 2. monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.Please take the real thing as standard.