describe Color: red patina Specifications: Diameter 38 mm Lock body material: zinc alloy Lock body diameter: M19 mm; Thread length: 20mm (short), 30mm (long) Suitable for 1-15mm sheet thickness. Suitable for 1-23 mm panel thickness. The factory password is: 000 Made of zinc alloy, strong, precise, safe and durable. The lock plate is thickened to about 2 mm, which effectively increases the service life. The surface is galvanized and polished, and the color is pure. Available in 2 colors, the surface is smooth and flawless. This combination lock has 1000 combinations to keep your security cabinet or safe secure enough. ??Easy to install. The length can be adjusted by turning the nut. No mounting screws are required, the lock snaps directly into the cabinet. How to change the password: There is a hole at the bottom of the lock to change the password. When open, use a small stick to cover the hole, do not release it. Then change the password, release when done, and the password change is complete. Just scramble the password after locking it. Scope of application: mailbox/cabinet/shoe cabinet/staff locker/locker/wire cabinet etc. Instructions for use: The factory password for this lock is 000, which is three zeros. When using it for the first time, set the password to 000, then hold the lock body with one hand (the threaded part, press the two parallel surfaces with your fingers) and turn the lock face with the other hand (i.e. the inclined surface with lines), clockwise or counterclockwise 90 degrees. (The first time you use it, you need to be a little stronger, and it will be easy to turn it a few more times.)