Pack Science 5 PIN Aviation Heating Coil Sizes: 30mm Axial, 25mm Axial, 25mm, 20mm, 16mm, 10mm flat PIN wiring:Pin1: Thermocouple-Pin 2 Thermocouple+Pin 3 : GroundPin 4 PowerPin 5 Power5 pin Aviation (metal-screw-in) plug Only Works for Pack Science and a few other models with aviation style plugs.Built-in K type thermocouple.Black Kevlar sheath to increase leading wire service life. PINs can be DIY rewired to match your controller needs. Please check your manufacture wiring diagram