Allegion plc makes security products including locks, door hardware and access control systems used in commercial buildings, institutions and residential properties, spun off from Ingersoll Rand to operate as an independent public company. Its products range from basic mechanical locks and door hardware to more sophisticated electronic access control systems that manage who can enter specific buildings or rooms using keycards, codes or biometric verification. Allegion's business benefits from steady replacement and renovation demand, since locks and door hardware in existing buildings periodically need replacement or upgrading regardless of new construction activity levels. The company's growth is tied to both new construction activity, which drives initial security product installations, and the ongoing shift toward more sophisticated electronic access control systems replacing traditional mechanical locks in commercial and institutional buildings.