The QAQB from Qualwave is a Between Series RF Adapter with Contact Resistance 1 to 2.5 mOhms(Outer), 1.5 to 3 mOhms(Center), Frequency DC to 4 GHz, Mating Cycles 500 Cycles, Temperature -45 to 125 Degree C, Voltage Rating 500 to 1000 V (RMS). More details for QAQB can be seen below.