Medco M4 cylinders are UL Standard 437 listed for physical strength and high security, with solid brass machined construction and strategically placed hardened-steel inserts to thwart drilling attacks. In addition to tumbler pins that lift and rotate, the M4 design includes four side pins: three finger pins and one lift pin, which must all interact with the sidebar to open, providing a high level of pick resistance.
T&S Brass: T&S LYNC
AAF International: AstroCel III Aero
Bentley: In Concert
Russelectric: ATS Remote Annunciator RTS-RA
Grass America: Institutional Hinges