2nd Generation Mechanical Combination Lock: This mechanical keyless entry door lock features a fully mechanical design that's tamper-resistant and doesn't require charging or battery installation. With simple setup and operation, it provides strong anti-theft security. The second generation allows for easier password changes, and the adjustable left/right handles give added flexibility Universal Compatibility with Various Doors: This mechanical keyless door lock comes with multiple sets of screws and square shafts, making it compatible with doors ranging from 1.4 to 2.5 in (35-65 mm) in thickness. It fits a wide range of door types including gates, garden doors, garages, storage rooms, wrought iron, aluminum, and fence doors Durable Zinc Alloy Material: The latch bolt is made from zinc alloy; this keyless mechanical combination door lock features a corrosion-resistant electroplated coating for enhanced water and rust resistance