Unit price is per piece. If you are looking for high precision, we recommend purchasing from BOURNS. Winding multi-rotational volume / Resistance value: 10 kΩ / Resistance value: ±5% / Rotation speed: 10 rotations 3600°±15° / Power: 2W vernier dial with stopper / Mounting outer diameter: 0.9 inches (23 mm) / Height: 1.0 inches (25 mm) / Hole diameter: 6.35 mm / Fixing method: Imo screw