72mm 36 - T36 Nickel Plated. The electronic AirKey battery operated euro cylinder door lock is a perfect solution for any door that can take a euro cylinder; it is designed for use with a suitable mortice lock (supplied separately). The AirKey Cylinder has a broad range of uses, it can be used anywhere a standard euro profile cylinder can be and is easy to fitted. This unit is has a standard turn on the inside of the door meaning that exit can be granted at any time (subject to correct installation) by using the turn. Should the batteries be left for too long a device is available to allow emergency battery power to be applied to the unit to allow normal operation. It is rated to IP65 meaning that it is suitable for both indoor and outdoor use and is suitable for temperatures between -20°C and +55°C and. It takes 2 x CR2 batteries which are easily replaceable and have a long life; the cylinder is supplied complete with batteries and an instruction manual for easy installation. Please note that to install the cylinder an assembly tool is required which is not included.. Drill and plug pulling resistant. Modular cylinder design allows for future adaptation. Easy to install. When disengaged the outside thumbturn turns freely providing a high level of anti-tamper protection