MIL Spe TNC male -male Coaxial Cable 16cm 6" E930168-10-W19 10MHz Micro-Coax Inc
Exact item shown, this is a coax interconnect with male TNC on each end, for 10MHz reference distribution, part numberE930168‑10‑W19 / NSN 4920‑01‑659‑5454. Connectors look like stainless steel.