1、Reliable Materials: The hole saw and shaft are made of carbon steel, combined with reinforced plastic guide template, ensure lasting performance even under frequent use, making it a reliable choice for professionals and enthusiasts 2、Accurate Drilling: Featuring an adjustable guide template, this set simplifies the drilling process by allowing accurate locating. With its snap lock arm for selecting door width and backset, achieving fast installation with few simple steps 3、Compatibility: Suitable for the most common lock sizes in daily life, this kit seamlessly compatible with wooden doors. Its versatility ensures compatibility across a wide range of applications, making it a must have for any toolbox 4、Applicable Range: The guide template can adapt to doors with a thickness range of 1-3/8 to 1-3/4 inch (35mm-43mm), as well as backsets of 2-3/8 inch (60mm) or 2-3/4 inch (70mm), ensuring secure installation on a variety of doors 5、Convenient Use: The door lock installation kit includes a snap lock arm guide template, 2 hole saws, and a shaft, eliminating the hassle of manual measurement and adjustment, ensuring users to complete installation quickly and efficiently