1、50Pcs in 1 Set: Includes 50pcs potentiometer dial control knob, with sufficient quantity, easy to use and replace. 2、Applicable Models: Suitable for RV24YN 20S, RV24YN 30S, WTH118 2W 20S, WH118 2W 20S and other potentiometers. 3、Plastic Shell: The potentiometer knob shell is made of engineering plastic, which is light in weight and good in insulation. 4、Brass Shaft: The hole shaft is made of brass, which has good strength and corrosion resistance, not easy to rust. 5、Standard Size: These potentiometer knobs have standard sizes, stable installation and good adaptability. 50 x Potentiometer Knobs Item Type: Potentiometer KnobModel: BEM-C1Material: Engineering plastic + brassKnob Diameter: Top end approx. 15mm / 0.6in, bottom approx. 18mm / 0.7inKnob Height: Approx. 20mm / 0.8inKnob Inner Diameter: Approx. 6mm / 0.2inProduct Quantity: 50pcsApplication: Suitable for RV24YN 20S, RV24YN 30S, WTH118 2W 20S, WH118 2W 20S and other potentiometers