推荐型号：3151C-071A、3153D-071A、2122A-135L、2201A
 
In Guangdong, in addition to Zhongshan Xiaolan, the "southern lock", there is also Shunde Leliu, the "home hardware capital of China". Leliu is the largest metal slide production base in Asia and the largest hinge production base in China, and Jusen, which was established in Leliu in 2001, focuses on the R&D and manufacturing of hydraulic buffer hinges. Thanks to the precision machining and manufacturing technology in hinges, Jusen has a unique patent for the structure of "lock in lock, key in key", which makes the safety of its lock products ahead of many manufacturers.
 
As its name suggests, the "lock in the lock, key in key" structure patent is a structure in which a small key that can be ejected is added to the key, and then another lock in the lock cylinder is activated with the small key, so that the lock cylinder can be completely turned and then unlocked. This patented technology is developed with the same idea as the MDILE interactive steel ball system, which is to prevent thieves from using the same unlocking tools as ordinary lock cylinders through a more complex and rare lock cylinder structure. However, when it comes to keys, the "lock-in-lock, key-in-key" technology does not have a complete solution like the interactive ball system, and it is difficult to configure a new key if you accidentally lose the key, so you need to take good care of the matching key.
 
Jusen has launched a total of 5 external door locks, all of which use the highest security C-level lock cylinder, and the lock body shell is made of stainless steel. Among them, the three door locks of 3151C-071A, 3153D-071A and 2201A are equipped with the patent of "lock in lock, key in key" structure, which has stronger anti-technical opening ability. Among the three, the highest price of 3151C-071A is 358 yuan, and the other two door locks are different in that the deadbolt structure is 1 oblique tongue 1 square tongue 1 cylindrical tongue, the strongest anti-violence opening ability, and its key tooth flower structure is more complex, further reducing the mutual opening rate. The 285 yuan 3153D-071A deadbolt structure is 1 oblique tongue and 1 square tongue, and 2201A is a common 1 oblique tongue and 2 cylindrical tongue structure, but the price of 168 yuan undoubtedly makes 2201A extremely cost-effective.
 
Jusen's other two products, 2122A-135L and pure copper core old-fashioned door locks, are common 1 oblique tongue 2 cylindrical tongue structure multi-tongue door locks. Compared with the 2201A, which adopts the patent of "lock in the lock, key in the key" structure and only 168 yuan, the 2122A-135L of 228 yuan appears to be at a higher premium. The 98 yuan pure copper core old-fashioned door lock is the second best choice for 2201A, and the C-level lock cylinder can ensure good security.