The Coil Kit is an accessory for the Mini-Ductor® Series and the Inductor® Series U-555. The kit enables you to heat and release seized nuts and bolts up to 1.5″ in diameter and other metallic hardware from corrosion and thread lock compounds.; Kit Contents; One 1 3/4″ pre-formed coil (MD99-607: 8.75″L x 2.25″W); One 1 1/2″ pre-formed coil (MD99-608: 8.5″L x 2″W); One 1 1/4″ pre-formed coil (MD99-609: 8.25″L x 2″W); One 1″ pre-formed coil (MD99-610: 8.25″L x 1.75″W); Two 7/8″ pre-formed coils (MD99-601: 5″L x 1.25″W); One 3/4″ pre-formed coil (MD99-611: 4.5″L x 1.25″W); One 7/8″ long pre-formed coil (MD99-605: 9.5″L x 1.25″W)