One of Morton's more useful gizmos, it is very similar to a running plier. You make your score, and then put the Safety Break (SB) over flat across the score line. Press down with your thumb on the middle of the top of the SB, with your index finger directly underneath the score line. The SB leaves no burrs on the edges of your glass, It also can break out shapes that are impossible to do with your pliers. Come in and ask for a demo, and then try it yourself.