Ilco Is the largest US-based key blank manufacturer located in Rocky Mount, North Carolina. Producing millions of keys each week, these keys range from original equipment keys manufactured for the lock and automobile industry to aftermarket keys sold to security professionals, and retail and service stores throughout North America. The Ilco brand is known for exceptional quality at competitive prices. They are a leader in key blanks as well as in automotive transponder technology, key cutting/duplication machines, and brass replacement cylinders.