Zero Tolerance and Emerson Knives put their hard-use heads together to create two new ZT knives. The Zero Tolerance 0620CF Tanto Knife Carbon Fiber Satin ZT Emerson M-390. This is one of them. The famous Emerson wave shaped opening feature is designed so that as you withdraw the knife, the wave feature catches the edge of your pocket and snaps the blade open. Once withdrawn, it's fully ready for use. The blade is a modified tanto style that locks securely into place with a frame lock that utilizes a hardened steel insert. A carbon fiber front scale gives this tough knife a touch of class.