Medeco B Small Format Interchangeable Cores (SFIC) provide quick and easy cylinder changes in the event keys are lost or stolen. Medeco B is an economic and efficient solution to rekeying needs. Medeco B easily retrofits into existing systems, significantly reducing installation time. The Medeco B retrofit cylinders are ideal for any application requiring unpatented key control that can be substituted directly into existing small format interchangeable core systems.