Security: 4-digit combination lock with 10,000 combinations. The metal wheels are easy to control. The desired combination can be easily restored at any time. High security and strong anti-theft. High quality: Double-layer construction, made of rust-proof zinc alloy, can withstand hammering, burning, and sawdust. Comes with a weather-resistant sliding cover to protect the combination dial from other weather damage. Large storage space: The internal size of the combination key box is 90mm * 70mm * 28mm (L * W * D), which can hold 5 house keys or 3 large keys at the same time, and can also hold car house keys, room cards, and other items. Easy to install: All necessary installation accessories (peephole installation and wall installation) are included. Bilingual instructions in Chinese and English are included to teach you easy step-by-step installation. Applicable places: garages, gardens, classrooms, factories, companies, shops, universities, dormitories, holiday homes, etc. Easy