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