2 x 1M OHM Linear Dual Taper Rotary Potentiometers B1M 1MB POT ALPHA Adjustment Type: Top Adjustment Power: 1/2W Resistance: B1M OHM Type: Linear DUAL Features Knurled Shaf Knurled Shaft Type B Suits Most Standard knobs Shaft Diameter: 6mm Shaft Length: 10mm Mounting Hole: 7.5mm Base Diameter: 16mm Base Height: 9mm