A grinding wheel is a tool used in the machining and processing of materials, especially metals, wood and plastics. It is used for grinding, polishing and other surface treatments. Grinding wheels are made of various abrasive materials and come in different shapes such as cones, cylinders or discs. They are used in many industries, including metalworking, glassmaking and stoneworking, to achieve a smooth and precise surface. They are suitable for fine finishing work.