Mini Ductor Coil Kit The Kit is an accessory for the Mini-Ductor and the Inductor U-555. The kit enables you to heat and release seized nuts and bolts up to 0.5 in diameter and other metallic hardware from corrosion and/or thread lock compounds. Includes:. One 1 3/4 Preformed Coil (MD99-607). One 1 1/2 Preformed Coil (MD99-608). One 1 1/4 Preformed Coil (MD99-609). One 1 Preformed Coil (MD99-610). Two 7/8 Preformed Coil (MD99-601). One 3/4 Preformed Coil (MD99-611). One 7/8 Preformed Coil I.D Long (9 1/2) (MD99-605) MD99-650 Prop65 information pending -