Numberial locks

Features:
1: The whole Lock is made of ABS engineer plastic
2: User sets his or her own random codes
3: Master key for emergency door opening and retrieve the lost code.
4: Keyless and no power supply

Application: All kinds of locker material (ABS plastic, metal, pvc and wood) in school, family and club
Outside size
1: The thickness of the steel material door should be less than 1mm
2: As for the wood or any other similar material locker, the thickness of door should be less than 20mm