Wheeler Rex invented the 79022 Glass Tube Cutter and is a versatile tool that can be used on a variety of brittle tubular materials including: all types of gauge glass, laboratory glass tubing, neon sign tubing, oil burner electrodes, porcelain insulators, thermocouple protection tubes, and other such small glass tubing. The tool is small enough to carry in a pocket easily added to a tool box and almost as simple to use as a pair of pliers, the difference the Wheeler Rex original "Squeeze and Pop" principle. The handles are opened wide and then the chain wrapped around the tube and hooked into the nearest chain pin into upper hooked jaw. Then with a firm grasp the tubing and applying a twisting force with the Wheeler Rex 79022 Glass Tubing Cutter while squeezing the cutter handles together quickly with the other hand. This quick motion is more effective than a gradual increase in pressure on the handles. Voila the glass tubing is now cut neatly and cleanly. The Wheeler Rex 79022 Glass Tubing Cutter cleanly cuts various glass tubing up to 1-1/2" outer diameter. Broken tubing may also be trimmed close to the break. Clean cuts can be made as close as 1/2" from the end of any tubing, and in some cases even closer with careful use of the Wheeler Rex 79022 Glass Tubing Cutter!