Choice Metal Running Pliers
Running pliers are specially designed for breaking glass along a scored line. After you have created a score line using your glass cutter, line it up to the notch in the upper jaw of the pliers. When you squeeze gently, the pliers put downward pressure on both sides of the glass, breaking it cleanly along the score line. Choice brand runners are heavy-duty spring-loaded metal running pliers with plastic-coated jaws and handles, and adjustable set screw for different glass thicknesses.