Abstract: A lock core with different thicknesses of lock plates. The lock core has different lock plates with at least two different thicknesses and specifications. The lock plates are arranged in a core body of the lock core so as to greatly increase the permutation/combination number of the security code and reduce the possibility of repetition of the same unlocking code. Also, this increases the difficulty of finding the correct unlocking positions of the respective lock plates, enhancing the security offered by the device.

Abstract: A double system lock apparatus comprises a lock shell, a combination lock, a key lock, and a control piece set. The lock shell has a panel and a main base assembled with each other. The combination lock has a plurality of rotating discs, coupling springs, couplings, and a shaft. The key lock has a lock cylinder and a sleeve set. From back to front, the control piece set has a first control piece, a second control piece, and a third control piece. By means of the control piece set working between the combination lock and the key lock, a double system lock apparatus of simple structure but well function has been formed.