Killeen Security Products (KSP), manufacturer of Small Format Interchangeable Cores, Mortise and Rim Housings, is located in Worcester, Massachusetts, and has been in New England since 1983. After more than 25 years of continuous service, KSP has built a strong reputation in the security industry. We are very proud to say that all of our products are made in the USA, but they can be found in effective operation all over the world.