FC Male-Female fiber optic attenuator fixed, SM, MM, PC, APC, 5dB, 10dB, 15dB, etc FC/APC ... 0.9 SC/PC 3.0 STLC/PC-SM-2.0LC/PC-S-SM-3.0LC/PC-S-MM-3.0LC- ... .0LC/PC-D/SMFC Male-Female fiber optic attenuator fixed, SM, MM, PC, APC, 5dB, 10dB, 15dB, etc FC, SC, ... attenuatorFemale--Female, Male--Female, fixed, variable, SM, MM, PC, APC, 5dB, 10dB, 15dB, etc -------all for your choice. optical fiber connectors