... high frequency): A. Various standard a tight firmware and other machine piece, hardware tool, handle drill, keep the hot upsetting ... Gas-moves components, Auto car-components, Motorcar-components, etc. machine metals parts, the Quenching for surface, of inside bore or ... treatment.3.WELD,DRILL (change to high frequency) Carbide cutting tools weld, for example: Tuning tool, Milling cutter, Planning tool, ...