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Product name: Medeco X4 SFIC Product characteristic: Mechanical cylinder Medeco X4 Small Format Interchangeable Cores (SFIC) provide utility patented key control for applications that dont require a UL listed cylinder. Addtional features include: -Cylinders can quickly and easily be changed by non-technical personal by using a special control key which will remove the core from the lock housing. A core with a new combination can then be inserted and the lock will then effectively be re-keyed. All of this can be done without having to take the lock apart which reduces the expense of calling outside service personnel to perform routine lock re-keys. -Solid brass construction for excellent durability -Spool shaped top and bottom pins add a measure of pick resistance -Solid nickel silver bottom pins increase wear resistance -Individual pin chamber caps provide for ease of servicing -Locks can be keyed alike, keyed different, or master keyed depending on your specific needs. -Installation instructions are included, but no accessory materials are required for installation or use.