"This Twin BNC Cable Series accommodates the need for low level signal patching and balanced line applications found in many test situations. Fittings have polarized, stepped keyways that look like, but do not mate with traditional BNC coaxial connectors. These Twin BNC connectors are constructed of machined brass with a non-tarnish nickel finish and gold plated contacts for resistance to corrosion and minimal signal loss. We stock these assemblies in 6 standard lengths from 1 to 10 ft."