Where are Threaded Inserts used?

It is a known fact that these great threaded inserts or bushings in simple words, are used in repairing stripped holes. These are also widely used in mold and cast threads thus eliminating a whole machine operation. It eases the task as you just have to thread the insert through. If the material is too thin to accept a thread, these threaded inserts come in handy. They are used as a changeover from metric to unified threads.