Features:Suitable for sliding barn doors,keep the door bottom stable,prevent doors bottom swinging out when slides;align perfectly,goes smoothly; Advantages:Adjustable and Dual mounting methods,suitable for Both -grooved and non-grooved doors,1pc works for one -grooved door,1pair clip for one Non-grooved door(dual mounting methods); Design:Easy to install,just to the floor,No door panel thickness limited; Installed on the floor to keep the door stable,prevent bottom swinging out when slides; Keeps sliding barn doors align perfectly,goes smoothly; Compact design,perfect for light mounting,keep safe; door panel thickness; Dimension:1.77 inch L X 0.78 inch W X 0.9 inch H(45mm x 20mm x 23mm); Colour:Black Material: Package Contents: 2 pairs of floor rails 8* mounting screws Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.