Feature:1. Wide Applicable Range: The lock mortise kit can be used for wooden and aluminum doors with a thickness range of 3.5‑10cm.2. With Height and Depth Limiter: The vertical guide rail has height and depth limiter, use this tool set can avoid exceeding the cutting area.3. With 3Pcs Blade Head: Tungsten steel blade with 3 sizes of 16mm 20mm 22mm, with good durability and practicality.4. Precise Cutting: The door lock hole opener kit has a sturdy structure and precise manufacturing, which can improve the accuracy and speed of mortise cutting.5. Easy Operation: The lock hole opener kit is easy to operate and is often used to install hotel doors, anti theft doors and door lock modification.How to Use:1. Open the package and take out the accessories2. Connect the hole opening rod to the sliding rod, and install a suitable cutter head3. Fix the assembled product to the door to be opened, then can punchSpecification:Item Type: Door Lock Hole Opener KitBlade Head Size: Approx. 16mm / 0.6in, 20mm / 0.8in, 22mm / 0.9inThread Diameter: Approx. 10mm / 0.4inSlot Depth: Approx. 13cm / 5.1inSlot Length: Approx. 28cm / 11inDoor Thickness: Approx. 3.5-10cm / 1.4-3.9inDistance from Door to Lock Center: Approx. 7cm / 2.8in Package List:1 x Slide1 x Punch Rod1 x Ruler1 x File2 x Wrench1 x Oblique Hole Accessories3 x Blade Heads1 x Storage BoxNote:Size error is ±2%.