The Grappler uses a net made of broad, heavy-duty nylon webbing connected to an articulated steel frame that attaches to a police vehicle’s front bumper. In a chase, an officer lowers the net to nearly level with the road, pulls up behind the fleeing suspect, and allows the rear wheel of the fleeing car to catch the net. Almost immediately the net tangles the wheel up, bringing the car to a controlled stop. Once the wheel is entangled, the officer then has the option of keeping the net tethered to his vehicle or releasing it and letting the captured vehicle stop on its own. Stock told FOX 10 that the idea came to him in the middle of the night after watching a show about high-speed chases.