The TekBox TBBNC1 BNC accessory set contains 4 pieces BNC to 4mm Banana adapters, 2 pieces BNC to terminal block adapters and a 50 Ohm BNC feed-through termination. TekBox TBBNC1 Parts list, Pieces Type 1 x N-male to Banana-male 1 x N-male to Banana-female 1 x N-female to Banana-male 1 x N-female to Banana-female 1 x N-male to terminal block 1 x N-female to terminal block 1 x BNC-female to BNC-male 50 Ohm feed-though adapter SWR &lt 1:1.5 @ 1 GHz