1. In the good old days we use to score the tubing with a file, add water to reduce the tension, say a prayer and snap. 
2. Glass cutter device, adapted to the small glass tube , circular blade, tweezers hand operation easy to use.
3. Glass cutter can be used for teaching or personal use, you need to pay attention when use avoid to cut yourself. If head are wear need to be replaced, so as not to affect the use. 
4. This tubing cutter is designed to score the circumference of the tube. It will score both plastic and glass producing a very clean break. 
5. Glass tube diameter can be cut to (Approx.)60mm.