Class A lock
Currently there are mainly a word key and a cross key on the market. The internal structure of the A-class lock cylinder is very simple, limited to the change of the marble, and the marble groove is small and shallow. The anti-technical opening time is extremely high within 1 minute.
Class B lock
The key is a flat-panel key with a double-row marble slot that has a row of curved, irregular lines compared to the A-level lock key face. The main types of lock cylinders are 3 types, computer double-row lock core, double-row crescent lock core, double-sided blade lock core. The anti-technical opening time is 5 minutes, and the mutual opening rate is high.
Super B level lock (C level)
The shape of the key is single-sided blade inner milling slot or outer milling slot key. The lock core type is side cylinder lock core; it can't be opened by the Ministry of Public Security for 270 minutes, and the regional mutual opening rate is zero (one million and one million) . The marble structure is locked by double row blades and V-shaped side columns.