Broken shear pins are no longer a problem with the #485 Extreme Machine, a tough and durable grinder/sander/buffer. The machine features a triple planetary gear unit with a steel coupling and full one-year warranty on parts and labor, even when used with grinding attachments. The six-pad Multi-Head Attachment accommodates Red Devil 4-in. 30 grit diamond plates for grinding and concrete removal. Taylor Tools. 303-371-7667.