It will score both borosilicate and glass producing a very clean break This tubing is designed to score the circumference of the tube Glass device , adapted to the small glass tube , circular , tweezers hand operational easy to use Glass can be used for teaching use , you need to pay attention when using to avoid yourself If for head is wear , then it needs to be replaced so as not to affect the use The wheel is also replaceable , Very handy device, Manufacturer: Watreketal