Completely push back the floor: The recessed bottom ensures that the door guide rail stays on the floor and will not scratch the floor, making it more stable and beautiful. Material: Carbon steel; Surface: Matte black; Door panel thickness: 8cm to 0cm. Package Content: 2 x Floor Guides; 4 x Screws; As you can see in the pictures, all necessary hardware is included. Easy Installation: Wall mounted with screws, no door slot required. Mount your door panel by fitting the rollers into the track. No need to drill holes in the floor. ADJUSTABLE: Adjustable from 3.2" to 0. Adjust the two rollers to fit the door panel, then tighten the screws at the bottom of the floor track to secure the rollers in their functional position. Note: The data are all measured manually, please allow 1-3cm error, due to differences in light and display, there may be some color differences, please refer to the actual item received.