Specifications:Fully adjustable rollers ensure smooth and safe sliding.It can be used with 3inch thickness doors, and it is suitable for all brands of barn door.You can fix 2 screws on the floor base plate, adjust and tighten, then the product installation will be finished.Built-in bearing provides ultra-smooth rolling, which is convenient to use.Type: Floor GuideMaterial: Carbon steelFeature: Carbon Steel, Easy to Installation, DurableSize: 10.5cm x 4cm x 5cm/4.13" x 1.57" x 1.97" (Approx.)Notes: Floor GuideDue to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Floor Guide2 x Screws2 x Anti-skid Belts1 x Wrench