Use:
Cover the optical fiber with horn mouth of the label stick, and then push the label hoop down along the label stick to clamp the fiber optical fiber.
Specification:
CQ-HMG-01, Φ 2.0, suitable for the Φ 2.0 optical fiber 
CQ-HMG-02, Φ 3.0 , suitable for the Φ 3.0 optical fiber