Unlike the 3-digit combination, the 4-bit combination lock provides 10000 code combinations, making it more difficult and secure than previous versions. In addition, the latch of this type of lock is strong enough that human labor cannot remove or break it. You don't have to worry about security anymore! The combination padlock is made of high-strength zinc alloy and hardened steel, which is sturdy and compact, and has additional resistance to cutting and sawing. In addition, high-quality materials are waterproof and rust resistant, making them a great outdoor combination lock. Widely used : This portable size combination lock is suitable for indoor and outdoor use. You can use it for gyms, schools, employee lockers, cabinets, toolbox, large luggage bags, and more. You can also use it with confidence in outdoor doors, fence doors, sheds, garages, buckles, and other places. Easy to set and reset your personal password, once you set the password combination, you are safe and sound. There's no need to play with the keys anymore.