1.Taking advantage of the gear meshing principle to achieve the torque and distance conversion.
2.Compared with the domestic ordinary lock, keys are handling much more lighter when rotating, and the bolt is much more flexible when stretching.
3.The sound is very light, it can only be heard the sound of the inside shaper gear mesh with each other when rotating the keys. So that, it solved the noise of the stuck plate strike with pull plate when open the bolt. And the combination of the lock cylinder and gear click wheel contact force is very small, essentially have no wear, which is prolonged the life of the lock.
4.The principle of using gear box, gear and the above part of the lock core are connected by the top cover with threaded hole. So that the core parts of the lock is difficult damaged by external forces, along as a whole, this particular case structure can be described as unique around the world.  
The thickness of the galvanized plate is 2.0mm, which is much more stiffness than the 1.2mm thickness of ordinarily lock, and strengthen the lock capability of safety, pick-proof and anti technical opened