Automatic Locking & Hold-Open Mode: The mechanical combination door lock automatically engages when the door is closed, so you don't have to worry about forgetting to lock it. The hold-open mode is ideal for areas with frequent access, allowing for easy entry and exit Easy Door Lock Replacement: This mechanical door lock includes an adjustable thumb knob, making it suitable for both left and right doors. The adjustable mounting hole distances (2.3 in / 60 mm and 2.7 in / 70 mm) and wider base plates avoid the need for large drilling, preserving the appearance of your door while ensuring enhanced security Durable Zinc Alloy Material: The latch bolt is made from high-strength zinc alloy; this keyless mechanical combination door lock features a corrosion-resistant electroplated coating that ensures durability. It's waterproof and rust-resistant, providing reliable security in all weather conditions, from cold winters to hot summers and rainy days Universal Compatibility for Various Doors: This mechanical keyless door lock comes with multiple screw sizes and square shafts, making it compatible with doors ranging from 1.4 to 2.5 in (35-65 mm) thick. It's suitable for a variety of door types, including garden gates, outdoor garden doors, garages, storage rooms, wrought iron, aluminum, and fence doors 2nd Generation Mechanical Combination Lock: This mechanical keyless entry door lock features a fully mechanical design, making it tamper-resistant without the need for charging or batteries. Its simple installation and operation provide high security, while the second-generation design allows for easy password changes. The adjustable left/right handles provide added flexibility