Crystek’s 50-GHz low-loss RF cable assemblies feature corrosion-resistant 2.4-mm 303 stainless steel connectors and three levels of shielding for low attenuation (loss) over distance (1.44 dB/ft at 50 GHz). They are in stock in standard lengths of 24, 39.4, and 48 in, with custom lengths available. The assemblies are suited for high-frequency interconnects in mission-critical applications and microwave laboratories.

More detail at http://articles.sae.org/13017 .