A glass cutter is a tool used to score and break glass sheets into desired shapes and sizes. It typically features a small, sharp wheel made of hardened steel or tungsten carbide that creates a shallow groove on the glass surface. This groove weakens the glass, allowing it to be snapped along the line with minimal effort. Using a glass cutter is straightforward. First, the user cleans the glass and marks the cutting line. Then, they apply even pressure while rolling the cutter along the line to create the score. Finally, they can break the glass by applying pressure on either side of the score, ensuring a clean edge.