This refers to one of the most common services provided by locksmiths. It generally entails disassembling a lock to replace the “tumblers” inside. Once completed, the lock requires a different key to operate than before. This is done to house locks when people move, divorce, are robbed, etc. Businesses rekey frequently when any key-holding employee quits or is fired. Body shops and auto dealers have new replacement locks rekeyed to match their customer’s key before installing them in the vehicle. If a lock must be replaced on a home or business, often it can be keyed to match the other locks on the building.