Door Lock Install Kit. EZ use template for quick set up. Professional quality Hole saws for precise and long service life. Simple, easy to use. Carbon steel lock installation kit designed for wood door sizes 1 3/8 and 1 3/4. Back set sizes 2 3/8 and 2 3/4. Contains 2 carbon steel hole saws 2 1/8 and 1 with pilot bit. Easy guide template included.