It is too tight to open using the thumb stud. It's a two-hand operation. But it is sharp Buds was outstanding, as usual

With a small size and super sharp scapel blade this knife is the perfect carry knife for everyday.

I once spoke with the owner of Marbles Cutlery, and we were talking about the difference between knife "collecting" and knife "Accumulating". When I see a knife such as this Boker Knife, I figured that it would fill some niche in the part that knives play in my life for work, hobbies, camping, etc. So, I am an "Accumulator". When I received this Boker Urban Survival knife, I was shocked at how small it really is (when folded, bout 1/2 the size of a Sharpie pen) but when I opened it, I was happy to see how sharp it is - scalpel sharp. The handle when the knife is opened, has a great grip for a thrust and slash. Opening it one handed takes some practice, but it can be done after some of the new wears off the mechanism. This knife comes with two ends, one simulates the top of a pen as it sits in your shirt, the other is a glass breaker, which came installed on my new knife. Since I come across the need to break the occasional car / truck window, it may come in handy, but I will make sure I am wearing gloves when I do. Once again, Bud's has the best price and FASTEST shipping (ordered on Tuesday, received it Thursday - same week). For the price and features, it is worth the $20 and change.