【Increased Security】This re-codable combination lock adds a 4-digit combination to your regular door locks, allowing you to set up up to 10,000 possible passwords, greatly improving security and privacy. The default password is 0-0-0-0, no key required, no worry about losing it. 【Sturdy and Durable】The door lock is made of high-quality zinc alloy, a solid 10 mm diameter steel bolt, and a waterproof coating, which protects the lock from rust and weathering, improves wear resistance and hardness, and ensures burglar resistance and durability. The handle is also made of solid steel, which won't break or come loose easily. 【2 Installation Methods】Our combination slide deadbolt lock supports 2 installation methods: vertical and horizontal. The deadbolt lock set includes a lock cover for horizontal use and a side metal door latch for vertical use. (Note: The lock must be aligned with the lock cover or side metal door latch.) 【Easy Installation】The deadbolt lock comes with 6 tamper-evident