A glass knife is a tool used to cut glass. Generally, the part of the glass knife used for cutting is made of diamond or alloy material that is harder than glass, and this part is at the tip of the knife. The small glass cutter can be divided into diamond glass knives and alloy roller glass knives. They are suitable for cutting flat glass with a thickness of 1-19 mm. They are essential professional glass cutting tools in the decoration and building materials industries.