Locksmiths specialising in master key lock systems will have access to a suite of tools and accessories to make the installation or repair of your mechanisms run smoothly. For a start, they may use on-location key-cutting machines to provide duplicates of your existing keys or lockpicks and tension sets if you are locked out. The professional firm you call might also use key extractors in case your key breaks or transponder tools if your electronic locks need to be reprogrammed.