Number tube/optical fiber label hoop

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.
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