Lock is used for physical purpose which is main based on mechanical device. Sometimes it is made of electrical device. Mainly lock is used for key. In ancient Assyria firstly invent lock device and key device. Then Egypt people develop lock with wood pin which is used for lock a door. Now lock and key is used more and used modern technology where one can see different shows. Warded lock which is designed by western people and it is more popular until now. Foe more information see here about 24 hour locksmith indianapolis . Locksmith more developed in 18th century where it is manufacture in industry commercially. One can find various types of Locksmith such as tumbler lock, Bramah lock, detector lock, pin tumbler lock, combination lock, time lock, segal lock, master lock and so on. There have a question is common Why people use Locksmith? People use it for rope lock, door security, access control, door chain security, Locksmith, physical security and so on.