The BLK-6+ from Mini Circuits is a DC Block with Frequency 0.01 to 6 GHz, Insertion Loss 0.05 to 1.2 dB, Breakdown Voltage 50 V, Return Loss 14 to 45 dB, Operating Temperature -55 to 100 Degree C. Tags: Connectorized, Inner DC Block. More details for BLK-6+ can be seen below.