This HD72 EN179 mortice escape sash lock is ideal for use with the Paxlock Pro and it is certified for use on inward or outwardly opening single exit doors and 60 minute fire and smoke doors (Category B/D of EN179). The sashlock is supplied without a cylinder. To retain security and fire protection, it should be used in conjunction with a 60 minute fire rated euro cylinder. This lock is weather & corrosion resistant, ideal for heavy duty use and suitable for bolt-through fixing.