Locksmiths help in locks and keys issues. Locksmiths are called either to duplicate a key, to install a new lock or else to open a lock, which has misplaced its key. Locksmiths are also used to make large vaults, custom-designed and costly to prevent and protect one’s investment. Locksmiths are used by any and all, to fit keys or to replace lost keys to automobiles and homes and changing of keys for homes and businesses to maintain security. Locksmiths also make keys for transponder-equipped vehicles and help in implementation and application of access control systems which protects individuals and assets for many large institutions. Locksmiths may be commercial, mobile, institutional or investigational. Locksmiths can also be specialists, such as an automotive lock specialist, a master key system specialist or a safe technician.