Breaker-grozier pliers are pliers

Pliers

Pliers are a hand tool used to hold objects firmly, for bending, or physical compression. Generally, pliers consist of a pair of metal first-class levers joined at a fulcrum positioned closer to one end of the levers, creating short jaws on one side of the fulcrum, and longer handles on the other...

 used by glazier

Glazier

A Glazier is a construction professional who selects, cuts, installs, replaces, and removes residential, commercial, and artistic glass. Glaziers also install aluminum storefront frames and entrances, glass handrails and balustrades, shower enclosures, curtain wall framing and glass and mirror...

s to break and finish glass in a controlled manner. They are dual purpose pliers, with a flat jaw that's used for breaking out scores and a curved jaw that's used for grozing flares from the edge of broken glass. Both jaws are serrated for removing flares and tiny points of glass.

To break out a score, the glass to be removed is held firmly in the pliers, with the flat jaw on top of the glass near the score line. A sharp bend downward breaks the glass at the score.

To remove unwanted glass flares and unwanted points , the glass piece is held with one hand with the pliers curved side up. A gentle upward rolling scrapes the glass edge (grozz) against the serrated teeth removes unwanted glass flares. This removal of grozz is known as grozing.

The tips of these pliers can also be used in a chewing motion to remove small sections of glass or nibble out deep inside curves.

Breaker/grozier pliers are a combination tool. Glaziers also use single-purpose pliers such as breaking pliers, with two flat jaws, and running pliers, which apply even pressure on both sides of a score to make a controlled gentle break on the glass.

See also

• Architectural glass
  Architectural glass
  Architectural glass is glass that is used as a building material. It is most typically used as transparent glazing material in the building envelope, including windows in the external walls. Glass is also used for internal partitions and as an architectural feature...
  
  
• Beveled glass
  Beveled glass
  Beveled glass is usually made by taking thick glass and creating an angled surface cut around the entire periphery. Bevels act as prisms in the sunlight creating an interesting color diffraction which both highlights the glass work and provides a spectrum of colors which would ordinarily be absent...
  
  
• Cathedral glass
  Cathedral glass
  Cathedral glass is the name given commercially to monochromatic sheet glass, which is thin by comparison with slab glass, may be coloured and is textured on one side....
  
  
• Fracture glass
• Fracture-streamer glass
• Lead came and copper foil glasswork
  Lead came and copper foil glasswork
  Lead came and copper foil glasswork are the arts and crafts of cutting colored glass and joining the pieces into picturesque designs.The traditional method uses lead came...
  
  
• Ring mottle glass
• Rippled glass
  Rippled glass
  Ripple glass refers to a sheet of textured glass with marked surface waves. Louis Comfort Tiffany made use of such textured glass to represent, for example, water or leaf veins....
  
  
• Stained glass
  Stained glass
  The term stained glass can refer to coloured glass as a material or to works produced from it. Throughout its thousand-year history, the term has been applied almost exclusively to the windows of churches and other significant buildings...
  
  
• Streamer glass