Heat and expand frozen, rusted, or thread-lock compound nuts with out the collateral damage from a flame. Uses high frequency magnetic fields to heat metal and only metal, induction heat. Operates on 120 volts/1000 watts of power!. Faster and safer than a torch Loosen seized hardware, bearings, gears, pulleys, lug nuts, inline applications, fuel tank straps, PDR applications (paintless dent repair), O2 sensors, and much more! U-form coil allows Mini-Ductor users to wind their own custom coil. This coil is 23" in length. Estimated 500 uses minimum. Heating a nut red hot will reduce the life of this coil. Changing the shape of this coil frequently will reduce its life expectancy.