... shaping (change to high frequency): A. Various standard a tight firmware and other machine piece, hardware tool, ... . machine metals parts, the Quenching for surface, of inside bore or part or for the whole. for example :Quenching for hammer ... high frequency) Carbide cutting tools weld, for example: Tuning tool, Milling cutter, Planning tool, Diamond saw-toothed weld, Saw tooth weld, grinding machine ...