Hardware Essentials sliding door guides are great for installation of new closet doors or just to replace a worn door guide. Guide simply fastens to floor. Tools required are marking pencil, power drill, 1/8 in drill bit and handheld screw driver. Simply, mark the installation location with your marking pencil, drill pilot holes and then fasten with included hardware. Designed for by-pass doors up to 1-3/8 in thick.