Material and installation note: 3 pack an all metal construction combination cam lock, the original password is set at 0-0-0.there is a hole behind the lock, use a small stick to press the hole and then choose your new password by At the same time, you remember this new password, finally release it - and your password has changed. Features: this combination cam locks are magnetic, erasable, cost-effective, security. Security password: a 3-digit zinc alloy code making it safe with 1000 possible combinations that are more difficult to break than 2-digit locks, which cannot be removed by force. Widely uses: use for school and home box box cabinet etc without key in its drawer applications and ideal for locker. Design: it is the lightweight and portable. also, there is no key in the lock, so there is no need to worry if your lock is lost. Specifications: diameter 38 mm Material of lock body: zinc alloy Surface treatment: conventional chrome plating, electrophoretic black, matte plating, titanium plating, etc. Diameter of lock body: M19 mm; Thread length: 20 mm; Suitable for plate thickness from 1 to 15 mm. The factory password is: 000 How to change the password: There is a hole for changing the password at the bottom of the lock. In open state, use a small stick to cover this hole, don't release it, then change the password. After finishing, leave the password go and the password change is completed. Color: silver white Quantity shipped: 3 pieces