The CAK-NF-NF from Xiamen HDG Telecom Equipments is a In Series RF Adapter with Frequency DC to 3 GHz, Contact Resistance 0.25 to 1 mOhms, Insulation Resistance 5000 MOhms(Dielectric Resistance), Mating Cycles 500 Cycles, PIM -160 dBc. More details for CAK-NF-NF can be seen below.