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 pre-grooved and non-grooved doors,1pc works for one Pre-grooved door,1pair for one Non-grooved door(dual mounting methods);Design:Easy to install,just secure 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;Unlimited door panel thickness;Dimension:177 inch L X 078 inch W X 09 inch H(45mm x 20mm x 23mm);Colour:BlackMaterial:POMPackage Contents:2 pairs of floor rails8* mounting screwsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.