2nd Generation Mechanical Combination Lock: This mechanical keyless entry door lock features a fully mechanical design, making it resistant to tampering without the need for charging or batteries. With easy installation and operation, it provides high security. The second generation allows for simpler password changes, and the adjustable left/right handles provide greater flexibility Universal Compatibility for Various Doors: This mechanical keyless door lock comes with a variety of screws and square shafts, allowing it to fit doors from 1.4 to 2.5 in (35-65 mm) thick. It's compatible with a wide range of doors, including gates, garden doors, garages, storage rooms, wrought iron, aluminum, and fence doors Durable Zinc Alloy Material: The latch bolt is crafted from high-quality zinc alloy and coated with a corrosion-resistant electroplated layer. This keyless mechanical combination door lock is built to withstand harsh weather conditions