Adjustable Function: Fully adjustable rollers ensure smooth and safe sliding. The bearings provide a very quiet and smooth glide when the door opens and closes. Adjustable double rollers to fit a thinner panel. Practical Function: The sliding door guide can be used with 3 inch thick doors, suitable for all brands of barn doors. Countersunk screw design to make our floor guide rest on the floor, no gap between the bracket and the floor, ensuring no damage to the floor. Easy to Install: This floor guide is easy to install. Just fix 2 screws on the bottom plate, adjust and tighten. Our floor guide is made of carbon steel and perfectly formed to provide a flush fit with the wall and floor. Convenient to Use: Built-in bearing of the door guide provides ultra-smooth rolling, easy to use. Unique Design: Carbon steel frame with black surface of the retaining roller, screw adaptation for maximum durability. If you really need a quality functional door guide, the ball bearing wheels are smooth