Quality Kit Includes, Glass Running and Breaking/Grozer Pliers Curved Jaw Running Pliers with Adjustable Set Screw Controls the Amount of Pressure Applied, and rubber Tips Using the Breaker & Grozer Pliers to Break and Nibble Glass Comfortable Premium Grips The ION TOOL Glass Pliers Kit make glass work fun. Designed for quality with curved jaws will help give you a great run. Simply position the pliers over the score at the edge of the glass, and gently squeeze for a clean break. Adjustable set screw also allows you to control the pressure applied to the glass. Breaking Pliers are quality designed to help break glass along a score line or can be turned over and used a grozers to nibble glass away from the edges.