The W1KF1W1-K03D3 from Rosenberger is a In Series RF Adapter with Frequency DC to 100 GHz, Connector Length 12.7 mm, Contact Resistance 6 mOhms, Insertion Loss 1.2 dB, Insulation Resistance 3500 Mohms. More details for W1KF1W1-K03D3 can be seen below.