Adjustable Sliding Door Rollers: Fully adjustable barn door track, fits doors up to 75mm thick. Safety Design: The floor roller with a special design, flat bottom and rounded edges protect your toes and knees from injury. Sturdy and Durable: The adjustable door track is made of carbon steel with a black powder-coated finish to ensure indoor and outdoor use. Easy to clean. Installation: Wall mounted with screws and no door groove. Adjusting the rollers in the track to fit the door panel. No need to drill holes in the floor. We Promise: We guarantee a 1-year warranty. If you have any questions, please contact us first, we will contact you within 12 hours to resolve the issue until you are satisfied.