Zoo ZBSD 5L British Standard Keyed Alike Deadlock - PVD Features:
UK Wide Delivery | SIIS Ltd
We recommend this Deadlock for all exterior doors as it provides a high level of security. The lock is operated by one complete turn of the key.
This Deadlock conforms to British Standard BS3621 & BSEN12209 and Fire Certification FD30/60 requirements. It also meets or exceeds the levels often specified by Home Insurance companies. Not to be confused with other cheaper locks that do not meet British Standard criteria.