Crimpers are tools used to permanently join two pieces of metal, or other materials. The crimper tool creates pressure on a piece of metal which causes it to form an indentation. When two pieces of metal are pressed together in this manner, the indented end creates an interlocking connection known as a crimp. This type of connection provides a secure, tight bond that cannot be easily pulled apart. Crimping tools come in a variety of styles and sizes, and are used in many industries such as computer building, electrical work, and automotive repair.