10-piece FC/A attenuator set for FC male and FC female connectors, offering multiple attenuation options. Attenuation values include 0 dB, 3 dB, 10 dB, 12 dB, 15 dB, 20 dB, and 7 dB. FM fixed attenuator with a flange optical adapter for secure installation and stable performance. Attenuation levels available include 0 dB, 3 dB, 7 dB, 10 dB, 12 dB, 15 dB, and 20 dB, with a 5 dB (FC A 3db) specification also included. Pack contains 10 pieces, designed for compatibility with FC connectors on both male and female sides. Key attributes: fixed attenuation, flange adaptor, FC compatibility, multiple attenuation options, compact and reliable design. Use scenarios: - Calibrating optical power in a lab or test bench to protect receivers and balance link budgets. - Setting up fiber optic test links or FTTH trials where precise attenuation is required. - Field maintenance or installation to tune signal levels and prevent overloaded PD/receiver inputs.