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Product characteristic: Mechanical cylinder Medeco 4 Rim and Mortise cylinders provide patented key control and the Medeco 4 version provides UL437 Physical Security in adaptable retrofit cylinder formats. Additional features include: - Solid brass construction provides high quality and long cylinder life - Set screw pin chamber caps allow quick and easy pinning and re-keying without the need to take the cylinder apart - Large variety of cylinder lengths and cam/tailpiece configurations provide excellent retrofit capability and reduce the need to replace the entire locking device - Installation instructions are included, along with two small screws. Otherwise, no accessory materials are required for installation or use.