Excellent Performance: The key storage lock box is is waterproof and anti rust, and it comes with a sliding guard to protect the digital dial from sun, rain, dust and snow. Reliable Lock Core: 4 digit password opening with anti decoding design, high security, reinforced hard steel lock core, durable and anti damage. Safety Improvement: The lock storage box provides 10000 combinations, therefore you can choose the unique combination you want, not easy to decode, more secure and reliable. High Strength Material: This combination lock box is made from sturdy and tough aluminum alloy, which is extremely hard, tough and impact resistant. Wide Applicability: Suitable for indoor and outdoor use, keeping keys for family, vacation homes, garages, emergency entrances, and real businesses. Suitable for cleaners, workers, pet care workers, the elderly and children. Specification: Item Type: Combination Lock Box Size: Approx. 9.6 x 8 x 4.1cm / 3.78 x 3.15 x 1.61in Material: ABS + Aluminum Alloy packing list: 1 x Key Lock Box 1 x Gasket 5 x Screw 1 x Nut 4 x Expansion Tube Excellent Performance: The key storage lock box is is waterproof and anti rust, and it comes with a sliding guard to protect the digital dial from sun, rain, dust and snow. Reliable Lock Core: 4 digit password opening with anti decoding design, high security, reinforced hard steel lock core, and anti damage. Safety Improvement: The lock storage box provides 10000 combinations, therefore you can choose the unique combination you want, not easy to decode, more secure and reliable. High Strength Material: This combination lock box is made from sturdy and tough aluminum alloy, which is extremely hard, tough and impact resistant. Wide Applicability: Suitable for indoor and outdoor use, keeping keys for family, vacation homes, garages, emergency entrances, and real businesses. Suitable for cleaners, workers, pet care workers, the elderly and children.