ERA 1530 & 1730 BS8621:2004 Auto Deadlocking Escape Nightlatch - 60mm SC/SC Boxe
The new BS 8621:2004 standard mirrors the BS 3621:2004 but is for ΓÇÿescapeΓÇÖ locks. Bolt hold back facility on the lock body of the lock. No keys required on the inside. iCan Products.