Machine-operated tools and machine tools and their structural parts and accessories, namely, adapters in the nature of wheel adapters for power-operated grinders, fixtures in the nature of work holding fixtures for precision machining applications, chucks, arbors, tool holders, collets, clamping heads, and machine clamps in the nature of metal clamps used for holding piece parts on machine tool tables, collets, abrasives in the nature of abrasive disks for power-operated grinders, power opera...