Model 50FHLB-xxx-100 is a uni-directional 100 Watt fixed attenuator that operates DC-3 GHz. It has a heatsink that is only 2.25 inches in diameter. It is available with 50 Ohm coaxial RF connectors N, 4.3/10, or 7/16. It is currently available with attenuation values 10, 20, or 30dB. There are mounting holes (8-32 threads) on both ends of the heatsink.