This product is an adjustable inductance with an adjustable magnetic core. It has a wide range of applications in radio communications. Typically used in LC/Xtal oscillation frequency adjustment. Product parameters: Inductance value: the core is inside the skeleton Core diameter 6mm height 9mm Adjustable minimum value: 17uH Adjustable maximum value: 37uH The lowest value of the magnetic core: 34uH (when the magnetic core is adjusted to the lowest position) Constant value: 13.8uH without core Applicable frequency: 25MHz~100MHz Number of turns: 50TS Wire diameter: 0.25mm