7 hard substance coating containing boron and carbon, sold as a component of power-operated machine tools, tool attachments, and engine parts; namely, taps, reamers, gears, broaches, drills, dies, punches, spindles, shapers, screws, injection nozzles, slide plates, ejector pins, core pins, heat seal bars, score knives, saws, slitter blades, razor blades, and other cutting tools, pistons, bearings, crankshafts, camshafts, wrist pins, fuel injectors, bearing journals, carbide inserts, valves, and molds