This 1-piece FC adjustable attenuator is designed for optical fiber attenuation. It is compatible with FM FCA, SC LC ST female-male SMA, FC-SC, FC-ST, SC-ST connectors. The attenuator provides an attenuation of 0-30 dB, allowing accurate signal control. Made materials, it ensures durability and long-term use. This damper is easy to install and adjust and is perfect for a wide range of applications.