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 This tubing is designed to score the circumference of the tube The wheel is also replaceable,Very handy device It will score both borosilicate and glass producing a very clean break, Manufacturer: KACCDE