Barn door floor guides consist of a heavy-duty carbon steel valve body and POM rollers to ensure durability and won't damage the door surface. The ball bearing design allows the door to glide smoothly and quietly. Ideal for any type of sliding door. Flat bottom design: The flush-mounted sliding door bottom guide can sit completely flat on the floor without the need for grooving or drilling. The bottom groove protects the floor from scratches caused by screws and won't damage your flooring, making it more stable and aesthetically pleasing. Adjustable sliding door guide: Can be adjusted freely, and the distance between the 2 rollers can be adjusted to fit the door panel. The maximum thickness can be used for doors up to 62mm. It can effectively prevent the sliding door from swinging. Easy to install: It is installed on the wall with screws, and no groove is needed for the door. By adjusting the position of the roller on the track to fit your door panel and tightening the screws at the bottom of the guide. No need to drill holes in the floor. Fits All Doors: The sliding door guide is stable and safe, can maintain balance, prevent tipping, and ensure the smooth sliding of the barn door. Suitable for All kinds of internal and external doors, such as closet, bathroom, living room, kitchen, garage, etc.