The Mercedes-Benz CLK coupe has adopted a smart key that can be launched 
Infrared signals can be used to open one or two doors, trunks and fuel filler caps, as well as to manipulate the windows and sunroof of the car. The more advanced smart key is like a credit card when the driver touches the door handle. The central lock control system starts to work and emits a wireless inquiry signal. After the smart key card makes a correct response, the lock is automatically opened. The engine will only start when the central processor senses that the key is stuck in the car.
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Non-tapping screws are machine Screw, the pieceworker to be fastened must be tapped with taps in the screw hole in advance to match the screw threads.
The difference between tooth screws and other screws depends on whether they can be used together with nuts. Tooth screws can be used with nuts. And relative to the screws of other teeth, there are self-tapping screws. The nut of this kind of screw has no bow teeth. As for the standard teeth and fine teeth are only different pitch, it is the nut of the machine screw
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