Feature:1. [Versatile Coil Kit] This kit includes 20mm (dia0.79in), 30mm (dia1.18in), 40mm (dia1.57in), 50mm (dia1.97in) coils, a 750mm (29.53in) long free forming coil and a flat type coil, can meet various working needs.2. [2.5mm Brass Core] Constructed with 2.5mm brass wire, these induction heater coils can withstand high temperatures up to 1200. They are flexible and can be bent for versatile applications.3. [Long Lasting] Each coil is designed to resist overheating and premature wear. They are insulated and coated with a abrasion resistant layer, as well as electroplated to prevent oxidation and ensure optimal contact.4. [Wide Applications] Induction heater coils are mainly used for heating nuts and rusted screws to loosen them, also suitable for automotive, machinery, heat treatment of various small metal parts.5. [Convenient Storage] This coil kit comes with a portable box for easy storage and portability. You can carry it with you while working and keep your work space organized and tidy.Specification:Item Type: Induction Heater Coil KitMaterial: BrassSpecification: 6 piece set of 2.5mm brass core coil combination (1 coil each for 20, 30, 40, 50 type, free type, flat type)Brass Core: 2.5mmApplication: Used for dismantling rusty bolts and nuts.Package List:6 x Induction Heater Coil1 x Storage Box