Sealey Oxygen Sensor Port Thread Chaser M12 x 1.25mm Features: Suitable for cleaning and repairing damaged threads on the exhaust oxygen sensor port. Use with 21mm socket. Technical Details: • Suitable for cleaning and repairing damaged threads on the exhaust oxygen sensor port. • Thread Size: M12 x 1.25mm. • Use with 21mm socket. • Model No. VS527 • Model No. VS527 Additional Information: • Suitable for cleaning and repairing damaged threads on the exhaust oxygen sensor port. • Thread Size: M12 x 1.25mm. • Use with 21mm socket.