The Mini-Ductor Coil Kit includes 8 different coils, 7 different sizes for most jobs mechanics run into. 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! Includes: 1(MD99-607)-1" I.D. preformed Coil (L 7" x I.D. 1"), 1(MD99-608)-1 " I.D. preformed Coil. (L 7" x I.D. 1"), 1(MD99-609)-1" I.D. preformed Coil. (L 7" x I.D. 1"), 1(MD99-610)-1" I.D. preformed Coil. (L 7" x I.D. 1"), 2(MD99-601)-7/8" I.D. preformed Coil, 1(MD99-611)-" I.D. preformed Coil. (L 7" x I.D. "), 1(MD99-605)-Long " I.D. preformed Coil. (L 11" x I.D. 3/4"), all inside a convenient case