https://www.futureelectronics.com/resources/featured-products/e-switch-ko-series-keylock-switches . The KO Series Keylock Switch from E-Switch. You can choose between barrel or flat key options, key code options, and more. Dozens of types and sizes of keylock switches are available. These keylock switches work great for security applications, personal transportation vehicles, or kiosk controls. https://youtu.be/IuYr9niUXRk