Feature: 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. Specification: Item Type: Potentiometer Knob Model: BEM-A02 Material: Engineering plastic + brass Knob Diameter: Approx. 20mm / 0.8in Knob Height: Approx. 13mm / 0.5in Knob Inner Diameter: Approx. 6mm / 0.2in Product Quantity: 50pcs Application: Suitable for RV24YN 20S, RV24YN 30S, WTH118 2W 20S, WH118 2W 20S and other potentiometers. Package List: 50 x Potentiometer Knobs Note: Please allow 1‑3mm error for manual measurement.