So many pliers—so many uses! Your first plier should be a breaker/grozer. Double duty! Their primary function is to grasp the glass securely on one side of a score when breaking it apart. Both jaws have serrated teeth to assist in their second duty, grozing.
Second pair you should buy is probably a running plier. This plier is designed to apply pressure under a score causing the break to follow (run) along the score line. Metal ones have the advantage of being adjustable for the thickness of the glass you are working with. Plastic also available.
Breakers. These have straight jaws and are designed to grasps the glass to assist in breaking long thin pieces of glass. The wide jaws meet only at the tip and not serrated.
The Safety Break. Morton is a very clever company who make very clever tools. One is the safety break system. The small one is a two-part method that begins the start of the break anywhere along the score. It permits several glass breaking options to the user and comes with full instructions. You must have a grid surface to use it. I used this when my children were young and wanted to cut glass. Morton also has the M-80 Safety Break. It is powerful, safe and easy. The M-80 is helpful with textured or rippled glass.
