N Female to N Female 4 Hole Flange, DC to 11GHz PN: A-NF-NF-489
N Female to N Female Adapter, 4 Hole Flange PN: A-NF-NF-288
N Female to N Female Adapter, 4 Hole Flange PN: A-NF-NF-072
N Female to BNC Female Adapter, 4 Hole Flange PN: A-NF-BNCF-097