Abrasive disks for power-operated grinders; Bits for power drills; Blades for power saws; Chisels for machines; Drill chucks for power drills; Machine parts, namely, fasteners for power-operated sharpening stones, namely, grindstone mounts; Polishing system for use in single-head machines comprising grinding and polishing discs for stone profiling and edges; Power drill bit extensions; Power tools, namely, burrs; Power tools, namely, drills, routers, circular saws; Precision machine tools, na...