Grinding wheels are tools used in various machining processes to shape and finish materials, primarily metals. They consist of an abrasive compound that is bonded together to form a wheel. When rotated at high speeds, these wheels can grind, cut, or polish surfaces, making them essential in industries like manufacturing and construction. The composition of a grinding wheel can vary, with different abrasives such as aluminum oxide or silicon carbide used for specific applications. The size, shape, and grit of the wheel determine its effectiveness for tasks like sharpening tools or smoothing rough edges, contributing to precision in metalworking.