The lock has a TSA certification mark. When you are in the process of customs inspection, the customs officers will identify the sign, unlock it with a special customs lock key, and re-lock it when it is finished. Your suitcase will not be forcibly opened to avoid damage 3-digit combination locks can be set to any combo of your choosing for security. The button on top of the padlock means you select your combination, press the button and will be open It adopts zinc alloy+ABS, which is exquisite and durable. The high-strength zinc alloy can withstand falling, knocking and damage without damage, making it a safe and reliable protection for your luggage and lockers The black wheel engraves the white number so you can see the password. Each time you dial a number, you will be able to jump a single digit accurately, won't get stuck, and won't dial the wrong one The diameter of the shackle is 3.8mm, which can lock items with smaller keyholes. Our locks are not only used for luggage, backpacks, doors, cabinets, gym lockers, school lockers Specifications: Item number: 01ST Material: Zinc alloy+ABS Size: 35 * 9 * 24mm