Features:Suitable for sliding barn doors,keep the door backside stable,prevent doorways 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 clip for one Non-grooved door(dual mounting methods);Design:Easy to install,just safe to the floor,No door panel thickness limited;Installed at the floor to keep the door stable,prevent the doorways bottom swinging out when slides;Keeps sliding barn doorways align perfectly,goes smoothly;Compact design,perfect for gentle mounting,keep safe;Unlimited door panel thickness;Dimension:1.77 inch L X 0.78 inch W X 0.9 inch H(45mm x 20mm x 23mm);Colour:BlackMaterial:POMPackage Contents:2 pairs of floor rails8* mounting screwsOnly the above package content, different products will not be included.Note: Light shooting and various displays may cause the colour of the item within the photo a bit various from the real thing. The size allowed error is +/- 1-3cm.