Electromagnetic Induction Heating Coil Heater Hot Coil Copper Coil High Frequency Heating Coil Features: The induction coil kit includes seven of the most commonly used prefabricated diameter coils and one free coil, suitable for a wide range of applications. 4 pieces: 1 x 18mm (Internal diameter), 1 x 22mm (Internal diameter), 1 x 28mm (Internal diameter). The length of the free-formed coil is 100cm. Each coil can resist overheating and premature wear, and they are durable enough to be used at least hundreds of times. These induction coils are flexible and can be bent for various purposes; simply bend them to meet your requirements. Our induction coil kits are electroplated to prevent oxidation and ensure conductivity, providing maximum work efficiency. These coils are insulated for user protection and coated to resist wear. If the insulation becomes damaged, replace the coil immediately. Parameters: Material: Copper Size: 100cm (free coil) 21x3cm, inner diameter: 1.8cm (Diameter coil) 21x3.5cm, inner diameter: 2.2cm (Diameter coil) 21x4cm, inner diameter: 2.8cm (Diameter coil) Package includes: 4 x Heating coils