Medeco Large Format Interchangeable Cores, LFIC Medeco® Large Format Interchangeable Core cylinders are designed so that cores can quickly and easily be changed by non-technical personnel by using a special control key. The Medeco® Large Format Interchangeable Core cylinders are available in a variety of different sizes, formats and security levels. Cores are available to fit into rim and mortise cylinders, key-in-knob locks, padlocks and bored auxiliary deadlatches and deadbolts. Medeco³ LFIC M³ & X4 CLIQ LFIC Classic CLIQ LFIC Dealer Locator Enter Postal Code Advanced Search For Export Security Solutions, Click Here. Click here for Engineered Security Solution dealers.