Method usage: The adjustable guide template facilitates accurate drilling and is equipped with a spring-locking arm to select the door width and door frame height. Drill vertically through one side of the door panel until you are halfway through, then drill through the other side of the door panel until you are fully penetrated. Functions and roles: The latch cannot perfectly replicate the shape of the latch on the door, and the door lock hole can also be cut using the chisel at the top, and the latch can be installed with the drill bit of the built-in driver. Professional and versatile: The built-in latch installation kit features switchable square or round blades and a top chisel, which helps to cut professional latch shapes and door lock holes. Strong material: The two blades of the door lock installation kit are made of durable carbon steel, and the guide template is made of reinforced plastic, which has a long service life. Applicable scenario: This design is suitable for the most common wooden door lock sizes used daily. The adjustable plastic guide plates are suitable for doors with thicknesses of 1-3/8in, 1-1/2in and 1-3/4in, as well as door frames of 2-3/8in and 2-3/4in