2 pcs of 500 OHM Linear Taper Potentiometer Pot B500 Features : Knurled Shaft Suits Most Standard knobs Power: 1/2W , Resistance: 500 OHM OHMS Adjustment Type: Top Adjustment , Type: Linear , Type B Mounting Hole: 7.5mm , Base Diameter: 16mm Shaft Diameter: 6mm , Shaft Length: 10mm