Easy Lockset Installation: this adjustable guide template allows for easy and accurate drilling, and the snap-lock arm can be applied to select door widths and backsets; No worries installation in a few simple steps Professional Quality: the hole saw and arbor are made of carbon steel, coupled with a reinforced plastic guide template, which allows this door lock installation kit to long-lasting performance even with frequent use Door Hole Drilling Kit for Wooden Doors: designed to work well with wood doors in the most common lock sizes for everyday use; Adjustable plastic guide template fits 1-3/8-inch and 1-3/4 inch thick doors and fits 2-3/8-inch and 2-3/4 inch backsets Notice: this door lock installation kit is compatible with wooden doors only; Do not drill through the door only on one side, you should drill bore hole halfway on each side of the door., Manufacturer: Akfldms