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 POT20K - 20K Linear Taper Potentiometer Photograph Features Knurled Shaft Type B Suits Most Standard knobs Shaft Diameter: 5.5mm Shaft Length: 10mm Mounting Hole: 7.5mm