Running pliers, also known as line pliers are used to break glass along a score line instead of using your hands or two pairs of pliers.
The Glass-Snapper is a running plier for 1/8" or thinner glass. The trigger action makes it easier and faster to break out difficult cuts that may be impossible by hand.
Operation is easy - Score your glass with a glass cutter. Hold one side of the glass with one hand. Push the glass into the Glas-Snapper jaws about 1/4" to 1/2" deep, lining up the scoreline with the center ridges in the Glas-Snapper. Gently squeeze. The glass will separate and break away, down from you. The glass piece you are not holding will fall away.