The Shank is the Flag Ship OutLaw Eyewear Sunglass model. It’s hingless Billet Aluminum frame construction not only employs a technologically advanced CNC machined manufacturing process , but also features interchangeable lenses. Dark lenses are available for day-time use, and Clear and Yellow are available for night-time use. The frame features 3 adjustable points to guarantee that precision tuned wind proof fit for the smaller person to the big boy. Choose extra lenses below