Item Type: Induction Heater Coil_x000D_ Product Material: Brass_x000D_ Brass Core: Approx. 2.5mm / 0.1in_x000D_ Application: Used for removing rusty bolts and nuts. 1With Brass Core: Equipped with 2.5mm brass core, the induction heater coil can heat up to 1200 within a short time, improving your efficiency. 28 Pieces in All: There are 2pcs 20mm coil, 2pcs 30 mm coil, 2pcs 40mm coil and 2pcs flexible coil with 750mm length, which will meet your needs. 3Wide in Utility: Mainly used to heat up rusty bolts and nuts for removal, the induction coil can be widely applied on car, machine and so on. 4Better Crafting: Having been through electroplating, all the bolt remove coil are insulating, and very durable with oxidation in long using. 5Convenient Uses: Light in weight and compact in size as well, the induction heater coil can be neatly stored in box for convenient carrying.8 x_x000D_ _x000D_ Induction Heater Coil 1 x Storage Box