Zoo ZBSS64SS 5L British Standard Keyed Alike Sashlock 64mm - Satin Stainless Features:
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We recommend this Sashlock for all exterior doors as it provides a high level of security. The latch is operated by a handle or knob and the lock is operated by one complete turn of the key. Suitable for sprung and unsprung applications.
This lock conforms to British Standard BS3621: 2007 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.