1、Applicable Models: These control knobs are used with the full range of WTH118 2W 20S and RV24YN 20S potentiometers. 2、50Pcs in 1 Set: The kit includes 50pcs potentiometer knobs, the quantity is sufficient and can be replaced at any time. 3、Plastic Shell: The knob shell is made of excellent engineering plastic, no burrs, light weight and good insulation. 4、Brass Shaft: With brass shaft hole, which is firmly fixed, not easy to rust or corrode, and can prolong the service life of the knob. 5、Standard Size: With standard diameter and aperture, has good adaptability, firm installation and not easy to fall off. 50 x Potentiometer Knobs Item Type: Potentiometer KnobModel: BEM-A02Material: Engineering plastic + brassKnob Diameter: Approx. 20mm / 0.8inKnob Height: Approx. 13mm / 0.5inKnob Inner Diameter: Approx. 6mm / 0.2inProduct Quantity: 50pcsApplication: Suitable for RV24YN 20S, RV24YN 30S, WTH118 2W 20S, WH118 2W 20S and other potentiometers