Function: 1. In the old days, we scratched the pipe with a file, added water to reduce the tension, talked, and prayed. Glass cutting device, suitable for small glass tubes, round knives, brushes, and easy-to-use hand controls. The glass cutter can be used for classes or personal use. You must ensure that you do not cut yourself when using it. If the head is worn, it should be replaced so as not to impair the use. This pipe cutter was developed to incorporate the scope of the pipe. It scratches at both plastic and glass and creates a very clean break. The diameter of the glass tube can be cut to (approximately 60 mm.