Hello. Welcome to Futurlec. The electronic components Superstore. To find the component your looking for, either search by Part Number or visit the relative department. Need Help. ROTARY POT50KBSHAFT - 50K Linear Taper Potentiometer Photograph Features Smooth Shaft Type B Suits Most Standard Knobs Shaft Diameter: 5.5mm Shaft Length: 35mm Mounting Hole: 7.5mm