Products within this family are the outermost components of modular connector systems listed as "heavy duty," which serve to hold components known as frames, within which inserts and modules are mounted, within which the contacts that carry electrical power or signals are contained. In this context, "heavy duty" refers to a relatively specific range of interconnect products that are typically of rectangular format and characterized by features such as cast metal backshells, guide pins, and pin-and-latch retention mechanisms.