Patented Shark-Lock mechanism designed and engineered by Andrew Demko Available in two variations, a clip point and a shark foot sheepsfoot Blade Length: 3" - Steel: AUS10A - Handle Material: Grivory The fin serves as a comfortable thumb ramp, which is jimped to increase control Interchangeable pocket clips for left/right carry The All New Ad20.5 by Demko Knives features the all new Shark-Lock. The Shark Lock mechanism is situated on the spine of the knife and operated with a ramp-like ‘fin.’