I had one of my knives held for me when I was in the Brisbane Mags court, and they told me it was illegal with the thumbscrew in. I stated that when working off a highrise crane hanging from a ladder I didn't really want to use 2 hands to open the knife :eek:.
He gave it back upon my exit.
Unless you have a specific need in mind I would recommend the half aerated blade as well, brilliant for cutting rope, zip ties etc.
I was spending the princely sum of about $10 delivered from Canada or the USA as I abuse the knives and they have a small lifespan.

