The 4-edge device has 4-way and rotating key holders, 2 sides of which are for all switch keys and 2 sides of which are for all machine keys and 4-point keys. such as the auxiliary spring of the jaw sole and the automatic system of turning the engine off and on when turning the key and eye protection.

The most important things in the system of turning and operating key devices are milling blade + key holder bits + key adjustment template May all the Tehrani products use the original milling cutter along with the steel template and very precise key holder bits with hard alloy. The next important thing that key makers and colleagues should pay attention to is the warranty and service of a product, which Chinese products do not have. All Tehrani products are provided with 1 year full warranty and 25 years of service.