It is a mechanism that automatically turns the deadbolt when a door is closed. The same task can be achieved with latch-bolts. Such a feature is useful for incidents like when you forget to lock the door while leaving your house.
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According to Kenneth Taylor, the 3 best cold air intakes for your chevy Silverado are the K&N Cold Air Intake Kit 77-3082KP, the K&N Cold Air Intake Kit 63-3082 and the K&N Cold Air Intake Kit 57-3058.