Feature: 1. PORTABLE AND HIGH TEMPERATURE RESISTANT: The induction coil kit consist of brass wire with a 2.5mm brass core and can be heated up to 1200℃, which is the most commonly used prefabricated coil and come with own storage tool box, so you can carry with you at all times when you are out working, while keeping your studio clean and organized 2. 4 PIECE COIL KIT: The 4 piece coil include 1 dia 0.79in(20mm), 1 dia 1.18in(30mm), 1 dia 1.57in(40mm), and 1 flat round cake coil. A variety of coil models and sizes can be adapted to work needs in a variety of ways to make your workflow smoother 3. LONG LIFE: Each coil is resistant to overheating and premature wear, durable enough to be used at least hundreds of times 4. GREAT FLEXIBILITY: These induction coils are flexible and can be bent for a variety of purposes, you just need to bend them until you achieve your expectations 5. ADVANCED INSULATION: These coils are insulated to protect you and are coated with a wear resistant coating, requiring a new coil if the insulation is damaged 6. HIGH EFFICIENCY PLATING: Induction coil kits are plated to avoid oxidation and ensure contact, providing maximum efficiency 7. WIDE APPLICATION: Induction heater coil is mainly used to heat nuts and rusty screws to loosen, can also be used for heat treatment of automobiles, machinery, various small metal parts such as gears, belts, bearings, etc. Specification: Item Type: Induction Heater Coil Kit Specification: 4 sets 2.5mm brass core coil combination(20, 30, 40, flat round cake coil 1 of each) Material: Brass Brass Core: Approx. 2.5mm / 0.1in Application: Used to remove rusty bolts and nuts. Package List: 4 x Induction Heater Coil1 x Storage Box