The anti-theft door locks are in accordance with the "General Technical Requirements for Anti-theft Security Doors" promulgated by the state and the Ministry of Public Security's "Mechanical Anti-theft Locks" regulations. To determine whether the mechanical locks for anti-theft doors are qualified can be determined from the destructive opening time; the anti-technical opening time; the same brand , Judge the mutual opening rate between the same specifications of anti-theft locks and other three aspects. There are two general anti-theft door locks, divided into A-level and B-level. The destructive opening time of the A-class anti-theft lock is not less than 15 minutes, and the anti-technical opening time is not less than 1 minute. The anti-destructive opening time of Class B anti-theft lock is 30 minutes, and the anti-technical opening time is not less than 5 minutes. Judging from the situation, the B-class anti-theft lock is the highest protection level in the GA/T73 "Mechanical Anti-theft Lock" of the Ministry of Public Security.