High Quality: The hanmir padlock is made of zinc alloy and stainless steel, resistant to rust and corrosion. It is the most durable and secure padlock. Security & Anti-Theft: 4-digit passwords provide 10,000 password combinations, which improves security and better protects your belongings. And the 4-position combination lock is ten times safer than the 3-position combination lock. Simple Operation: Large numbers are easy to read, you can use your favorite numbers to set or reset your password. Please remember your password after you set it up. Widely Use: You can use them anywhere and without having to carry a key. Suitable for most tasks such as light fitness/exercise, school and employee lockers, cabinets, boxes, buckles etc.