Maratac Pocket Grappling HookThe pocket grappling hook was originally built by EOD Robotics, Inc. at the request of a desert warfare operator. He explained his need for a light weight, reusable grappling hook. Grappling hooks are used by soldiers in warfare to snag trip wires and tear down phone lines. While you may not be walking through a minefield anytime soon, you can easily pull down loose tree limbs and other hard to reach objects with a handy, collapsible grappling hook.