Hillman 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. Available in both adjustable and a fixed double sliding door guide. Tools required: marking pencil, power drill, 1/8" 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" thick.