an appropriate image to help the Just Cause Wiki! The Protec Grappler G3 a.k.a. Projec Grappler a.k.a. Grappler a.k.a. Grappling hook is a harpoon - gun , in the Just Cause game series . Contents 1 Just Cause (1) 1.1 Technology 1.2 Uses - Obtaining a helicopter 1.3 Uses - Parasailing