Keystone jack - hdmi female to female coupler - white the hdmi keystone coupler allows you to easily add an hdmi jack to any standard keystone wall plate, surface mount box or patch panel.The snap-in hdmi jack is simple to install and provides you with a robust f/f in-line hdmi coupler.Here’s an in-depth look at the specifications of this hdmi keystone jack: type: hdmi 19p f/f keystone coupler rohs compliant fits standard keystone wall plate, patch panel or surface box gold plated color: white