Features SPECIFICATIONS: Includes 2pcs 20mm coils, 2pcs 30mm coils, 2pcs 40mm coils, 2pcs 750mm free coils, a 50mm coil, and a circular pie coil, multiple models to meet more needs. 2.5MM BRASS CORE: These induction coils use 2.5mm brass core wire, can be heated to a high temperature of 1200℃, resist overheating and wear, reliable and durable. GOOD FLEXIBILITY: These induction heater coils have good flexibility, which can be bent to adapt to various usage situations, making them easy to operate and replace. INSULATION COATING: These brass core induction coils have insulation and wear resistant coating, electroplating process avoids oxidation, improving work efficiency. WIDE APPLICATION: The induction heater coil kit is mainly used to heat rusty nuts and screws to loosen them, suitable for heat processing of gears, pulleys, and bearings. Specification: Item Type: Induction Heater Coil Product Specification: 10Pcs 2.5mm Brass Core Coil Combination (20 Type, 30 Type, 40 Type, Free Type Coil Each 2pcs, 50 Type, Flat Type Coil Each 1Pc) Material: Brass Brass Core: 2.5mm Application: Used to remove rusty bolts and nuts Package List: 10 x Induction Coils 1 x Storage Box Package List 10 x Induction Coils 1 x Storage Box