Key FeaturesSPEED CONTROL: The machine is designed with low and high-speed options that allows the operator to make an appropriate choice for R.P.M. TOOL ADAPTOR DESIGN: Morse taper design that serves as two modes of drilling, allows loading in ¡¨annular cutter¡¨ or ¡¨ twist drill¡¨ etc. You can put annular cutter or buy our special structure DOUBLE COIL MAGNETIC BASE: When the power outage or any coil burning that still keeps another coil remain to avoid danger. ARBOR SUPPORT BRACKET: Aligns the cutter precisely, increase cutter, motor life and less tool arbor vibration. SWITCH PC BOARD: Regulate the voltage to avoid burning. MAIN APPLICATION: Especially designed for general heavy duty machine or difficult to shift the objects such as skeleton of high building, H-structural steels, large steel plates, shaped bars, framework, and other machinery, shipbuilding, bridges, reinforcements, construction materials and steam furnace etc hole drilling. POWER & PERFORMANCE: Designed with the greatest possible consideration for lasting smooth powerful performance that reducing cutter crack probability to be lowers cutter cost.