N&C Euro Profile Cylinder, 5 Pin security with additional Anti-Bumb, Anti-Pick and Anti-Snap features. Suitable for FD30 & FD60 fire doors and tested to meet and exceed BS EN 1303, Supplied with 3 Keys as standard - Master Keyed: A Stocked master key system where by all locks are opened by a single key, but each of the cylinder locks are opened by their own key also.