Machine-driven tools, namely, tools for machine tools, namely, cutting machine tools with fixed or exchangeable cutters made of hard cutting materials, namely, drilling tools, boring, reboring and boring-out tools, [ super-finish lathe tools, ] countersinking and deburring tools, lancing tools; cutting machine tools with exchangeable boring-out rods and boring-out steels, namely, chisels for inside and outside work and lancing; support, guide, adjusting and clamping elements for use with machine tools; manually adjustable and machine-adjustable machine-driven tools; machine-driven special tools and their components, namely, [ machine-driven saws, saw blades and saw inserts made of hard cutting materials for the aforementioned saws, ] power-operated metal cutters, power-operated drills, power-operated pilot, center and lead drill bits for drills, reborers and out-borers, [ super-finish lathe tools, reamers, countersinkers and deburrers, ] lances, threaders; tool-holding fixtures or adapters, namely, taper shanks, clamping chucks, extension and reducing pieces for machine tools; machine-driven modular add-on tools with couplings as interface and separation points for a manual or machine-operated coupling of tools to machine tool spindles and tools; cutting inserts, reversible cutting plates [ and lathe chisels ] made of hard cutting materials for use in machine tools; tool holders with firmly fixed or exchangeable cutters for use in machine tools, namely, reversible cutting plate inserts, lathe chisels, clamping and mounting inserts and holders, super-finish lathe inserts and parts thereof, namely, bolts, clamps and screws