This helmet lock is rust resistant, which is durable for you to long timed reused. Adopted with mechanical structure design, the code lock is high security for you to used. Made with steel wire and ABS material, this product is solid and durable. The length of this product is 7cm and width is 5.8cm. The cable lock is good purpose for luggage, helmet, bikes, work equipment, briefcase, purse, doors, gates, and many other items safe. Item Name: Helmet Lock Material: ABS,Steel Wire Features: Solid, High Precision, Rust Resistant Size Details: Size: 7cm x 5.8cm/2.76" x 2.28" (Approx.) Notes: Instructions for Use 1. Please change your password before using. (The factory password is 0-0-0) 2. When changing the password, retract the cable (A) and press the cable head (B) down, turn the code wheel (C) to the number you want, and then pull the cable head (B) Just go out. Please remember the password you set. 3. The cable switch (E) can control the entry and exit of the cable lock. When you press the cable switch, the cable can be accessed and lifted, and the cable can be fixed to the length you need. 4. When locking, first align the password between the mouth and mouth, then insert the cable head into the lock hole. When you hear the click sound, it will be locked. The password is upset. 5. When unlocking, please correct the password first, press the unlock switch (D), pull out the cable head from the lock hole, and then press the cable switch to retract the cable into the lock body. 6. Children should be used under the guidance of an adult. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Helmet Lock