HIGH SECURITY: 4-digit combination locks are more convenient - compared to 3-digit combination locks, adding protection against thieves, who can usually be hacked in minutes. The 4-digit number has more than 1000 combinations that are easy to keep and cannot be removed manually. Perfect and high-quality design, fashionable zinc alloy design, rustproof, weatherproof, small in size, light in weight, easy to carry, strong and pressure resistant, and cannot be disassembled manually. Applicable occasions: schools, gymnasiums, sports bags, tool boxes, garden gates, filing cabinets, outdoor storage, staff lockers, sheds. The silver look is very versatile and can be worn on any occasion. Resettable and easy to use: you can set up or reset your own combination in 4 steps, the method of use can change to learning of product packaging / product image introduction.