High efficiency: With a maximum output power of 1.80KW, it quickly heats metal parts to over 800°C in a short time, ideal for rapid heating before processes like quenching, bonding, and welding. Design: This induction bolt removal heater is engineered to handle complex metal heating challenges, such as heating severely rusted or hardened nuts, bolts, and screws for fast removal. Accessories: Includes four coils of different sizes, with a maximum heating temperature of 1472°F, suitable for high melting point materials and flexible use in metal welding, automotive repair, and machining. Heat dissipation: Features ventilation holes and a built-in cooling fan at one end to effectively prevent overheating, ensuring extended device lifespan and reliable performance. Set: Comes with four coils of varying diameters to accommodate diverse repair needs, enhancing versatility for various applications without specifying exact sizes.