The flat jaw is scored by lever action to reduce hand fatigue You can use on different thicknesses of glass steel, and hard Great tools is not only for glass fusing, breaking small pieces of glass for, cutting glass for window panes and for most glass projects But aslo Install for Hardwar easily Adjustable set screw allows you to control the amount of pressure applied, set screw is easy to adjust, and properly tapped; you can use on different thicknesses of glass, Manufacturer: Tsophreniq