Adjustable Sliding Door Rollers: Fully Adjustable Barn Door Guide Safety Design: Floor roller with special design, flat bottom and rounded edges protect your toes and knees from injury. Sturdy and Durable: The adjustable door guide is made from carbon steel with a black powder-coated finish to ensure indoor and outdoor use. Easy to Install: Mount on the wall with screws, and no groove is needed for the door. By adjusting the rollers in the track to fit your door panel. No need to drill holes on the floor. Size:1 Pack - Black Name: Adjustable Floor Guide. Color: Black. Fully flush with the floor. Special design with bottom cut slot to allow the barn door bottom bracket to sit completely flat on the floor and the fixing wall screws will be aligned flush with the bracket to avoid popping out and scraping against the door.