Feature: 1. 2.5mm Brass Core: This induction coil kit features a 2.5mm brass core, capable of withstanding high temperatures up to 1200°C. Includes a storage box for convenient portability and organized workspace management. 2. 4 Coil Kits: Includes four coils with diameters of 20mm, 30mm, 40mm, and a 750mm free-length coil. Multiple sizes accommodate diverse application requirements. 3. Long Lifespan: Designed to resist overheating and premature wear, enabling hundreds of uses. 4. High Flexibility: Coils are highly flexible and can be manually bent to suit specific tasks. 5. Advanced Insulation: Coils feature durable insulation and wear-resistant coating for safety and longevity. Replacement is recommended if insulation is compromised. 6. Efficient Performance: Electroplated surface minimizes oxidation and ensures reliable electrical contact for optimal efficiency. 7. Wide Application: Suitable for heating nuts, bolts, and rusty fasteners to aid removal. Also used in heat treatment of automotive, mechanical, and small metal components such as gears, pulleys, and bearings. Specification: Item Type: Induction Heater Coil Kit Product Material: Brass Brass Core Diameter: Approx. 2.5mm Set Contents: 4 coils (20mm, 30mm, 40mm, and 750mm free-length) Package Includes: 4 x Coil, 1 x Storage Box