how do you remove a broken drill bit

how do you remove a broken drill bit EDM-8C can fast remove broken taps, drill, drift, screw, plug gauge, etc., without damaging to the work piece, easily process on work pieces at any size, especially effective for large machine tools. Functions and Features 1.SFX-4000B abide by the principle of Electrolytic Corrosion to remove broken tools, no direct contact, no external force and damage to the work piece. 2. Portability: Light weight. Small Size. Carrying handle on the top