[Recodeable and Keyless Security] With our 4-wheel recodeable combination lock, you can choose your favorite code from 10,000 different combinations. And the code can be called silently. Security comes from the simplicity of configuration and resetting the combination code without hassle. You don't need to carry a bunch of keys and change the lock, because it uses digital encryption method. [Waterproof and durable zinc alloy material] The bolt code lock is made of zinc alloy, durable, weatherproof all year round, the body has anti-rust coating, so it is waterproof, the cylinder screw knob is chrome-plated. The sliding combination lock is equipped with a pick-resistant knob, a 10mm diameter solid steel sliding bolt and one-way security screws. [2 installation methods] ① Sleeve installation: When the door frame and the door leaf are in the same plane, the installation method with metal sleeve + bolt is used. Side door installation: When the door frame and the door leaf are at a 90° right angle, with the installation method of side door ring + bolt, the door frame should be opened through the hole.<p> [Easy to use] When unlocking, you can turn the code and pull the handle up to open the door lock code. When the lock is closed, you can turn the code, move the handle down, insert the pin into the keyhole, turn the code, and then hang the lock. When unlocked, be sure to enter your password in time to avoid accidental locking. [Wide application range] The size is 80*100*48mm, the combination door code bolt is easy to install and mount on most compact spaces. Protect your sheds, barns, cabinets, doors, iron gates, wooden doors, fences or windows. It is the perfect lock choice for both indoor and outdoor environments.