Seasoned welding professionals will say that their grinder is an extension of their arm. From weld prep to cleanup, the delicate touch of a professional with a grinder makes a big difference - Fig. 1. But no matter which size grinder, without the right abrasive grinding wheel, projects can take more time and have a higher cost in the long run. When choosing an abrasive grinding wheel, consider each wheel's type (profile), composition, grain size, hardness, designated application, and rpm rating. By understanding how each is called out, the decision process will be easier and the work more efficient.