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Laser Cut Key For Cars As a way to combat the theft of keys, car keys now include improved locking mechanisms to prevent theft. The majority of modern vehicles use transponder or laser cut keys that must be programmed to work with the vehicle's system. The edges of traditional cut keys are straight and easy for locksmiths and thieves to copy them. Mechanical Keys The classic mechanical key is a physical device that works with the lock cylinders of a car's ignition as well as door locks.