Stable locking system:Mechanical door lock have a more stable locking system, No batteries Needed, Don't warry being locked outside of your gate due to circuit problems.14-key combination password14-bit alphanumeric combination button, the security of our Mechanical keyless door lock is more than 100 times that of pure digital buttons. The keyless entry door lock password supports 1-13 digits, no need to enter in order, the elderly and children can also easily open the Mechanical keyless door lock.Security deadbolt: 304 high-quality stainless steel, surface rust-resistant processing, keep bright and shiny for 10 years, sturdy and well-made, not break, thicken waterproof washer IP54 weather resistance, anti peeping, solid lock cylinder.Easy Installation: Mechanical keyless deadbolt lock with instructions for install, non-professionals can easily set a password and install it successfully within 1 hour. The holes required for installation are small and will not damage your door.If you don't want to drill holes on the door, you can purchase a GB2020 gate lock box to install the lock.Applicable Doors: mechanical keyless entry door lock is suitable for thickness of the door 1.38" to 2.56" (35mm-65mm), such as fence gate, front gate, side alley/yard gate, screen doors. The center distance of the latch is standard 2-3/8"(60mm). The mechanical Push Button door lock with knob can be manually locked whether indoors or outdoors.