Knock N’ Lock
Here is a short video I took of this marvelous cylinder today.
This cylinder is sold to one of my customers but I can I was very sorry to let it go..
Knock n lock is an Israeli invention in which the lock is operated by electric pulses or knocks.
Raf's lockpicking world 
Interesting design. I suspect it is easily vandalized with so much leverage provided by that huge handle though. Rick
May 13, 2014 at 11:56 am
Wow! How secure is it?
May 26, 2018 at 9:28 am