The drilling machine adopts split type, easy to install and disassemble, industrial-grade linear bearing and precise scale, which can improve the cutting precision speed and work efficiency you are using it for the first time, it is recommended to make use of cut on other discarded boards of equal thickness to avoid damaging your new wooden door SIMPLE BUT PRACTICAL - The door lock jig kit includes a mortiser, 3 M10 cutters, 2 spanners, a ruler, a wood chisel, a plastic suitcase, and 10 other accessories. It has a simple construction but is practical in drilling. RIGID AND SHARP CUTTERS - The mortice lock fitting jig will come with 3 tungsten steel cutters, 0.79"/0.87"/0.94" (18/22/24 mm) of sizes. They are sturdy and sharp enough to make clean cuts. EASE OF INSTALLATION - The lock mortiser is easy to assemble and install on the door, even for beginners. With simple marks on the door and a power drill, you can make it with ease. EXCELLENT PERFORMANCE - The door lock mortiser kit features parallel slide rails that can completely clamp the door, ensuring a stable drilling process. WIDE APPLICATION - The mortise jig is used on wooden and aluminium doors with a thickness of 5.3"/13.5 cm. It is suitable for installing hotel doors and security doors or door lock modifications.