Light, small, portable, compact design. High speed & high efficieny and low cast. Simple operation, easily remove broken tap. Full power source choices: 100V/110V/120V/200V/220V/230V/240V, 1 PHASE, 50HZ/60HZ. Dielectric: Using ordinary tap water as machining dieletric liquid. Electrode: Using any brass bar as electrode. Flexibility: Machining easily even on a large workpiece. No damage: Remove taps easily withot dmage the threads. Complete funcions: Auto feed, depth setting (stop at a specific depth), selectable arcing timer, auto retrace, workhead swivel alarm message: depth arrival, arcing, over-temp. More applications: Starting hole for Wire Cut EDM. Cutting Tungsten Carbide or any harden steel.