◎FEATURES: Light, small, portable, compact design. High speed & high efficiency and low cost. Simple operation, easily remove broken tap. Full power source choices100V/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 without damage the threads. * Complete functions: Auto feed, depth setting (stop at a specific depth), selectable arcing timer, auto retract, workhead swivel alsrm messages: depth arrival, arcing, over-temp. * More applications: Starting holes for Wire cut EDM. Cutting Tungsten Carbide or any harden steel.