The AD20.5 by Demko Knives features the impressive Shark Lock and an even more impressive price point. The Shark Lock mechanism is situated on the spine of the knife and operated with a ramp-like ‘fin’, allowing you to flip the blade open and closed at will. It's probably the best thing about this knife and design, how quickly it can be deployed and ready for action. It acts as a blade launcher and a little wrist action is all it needs. Comes with original knife tube. Excellent condition.