Electromagnetic Induction Heating Coil Heater Heating Coil Copper Coil High Frequency Heating Coil Features Induction coil kit includes seven of the most commonly used prefabricated diameter coils and a freeform coil for a wide range of applications. 4 pieces: 1 x 18mm (inner diameter), 1 x 22mm (inner diameter), 1 x 28mm (inner diameter). The length of the free formed coil is 100 cm. Each coil is resistant to overheating and premature wear and is durable enough to last at least hundreds of uses. These induction coils are very flexible and can be bent for various purposes, you just need to bend them until they meet your expectations. Our induction coil kits are electroplated to avoid oxidation and ensure contact, providing maximum operating efficiency. These coils are insulated to protect you and coated to prevent wear and tear. If the insulation is damaged, the coil will need to be replaced with a new one. Parameters Material: Copper Dimensions: 100 cm (without coil) 21x3 cm, inner diameter: 1.8 cm (diameter coil) 21x3.5 cm, inner diameter: 2.2 cm (diameter coil) 21x4 cm, inner diameter: 2.8 cm (coil diameter) Package includes 4 heating coils