Product Details ①. 4-digit combination lock eliminates the need for multiple keys, allowing secure key storage outside buildings with code sharing among family members. ②. Constructed with durable steel to ensure long-term use and proper key security. ③. Programmable lock for easy setting and subsequent changes as needed. ④. Simple assembly requires only a drill with a wall drill bit and a Phillips screwdriver; installation hanger included. Specification ①. Color: Black/Gray ②. Material: Metal/Plastic ③. External dimensions: 12 x 9 x 4 cm (4.7 x 3.5 x 1.6 inches) ④. Internal dimensions: 10 x 7 x 2.5 cm (3.9 x 2.8 x 1.0 inches) ⑤. Weight: 0.292 kg (0.64 lbs) Package List ①. Key safe box ②. Dowels Warm Tips ①. Ensure the installation location is dry and sheltered to protect the lock mechanism. ②. Memorize or securely store the combination code; avoid sharing with unauthorized individuals. ③. Regularly check the lock and screws to maintain stability and functionality.