2 pcs of 20K OHM Linear Taper Potentiometer Pot B20K Features : Knurled Shaft Suits Most Standard knobs Adjustment Type: Top Adjustment , Type: Linear , Type B Power: 1/2W , Resistance: 20K OHM OHMS Shaft Diameter: 6mm , Shaft Length: 10mm Mounting Hole: 7.5mm , Base Diameter: 16mm