The most authoritative answer in 2024
-

-
Amelia Patel——Studied at the University of Cambridge, Lives in Cambridge, UK.
Single cylinder deadbolts and
handlesets are operated with a key from the outside, but do not require a key for locking or unlocking from the interior of the property. Instead, the door is locked or unlocked using a thumb-turn style lever. ... There is no thumb-turn mechanism on a double
cylinder lock.
read more >>
About “Single cylinder、handlesets、cylinder”,people ask:
QuesHub is a place where questions meet answers, it is more authentic than Quora, but you still need to discern the answers provided by the respondents.