Audtek Electronics snap-in keystone couplers, when used with keystone wall plates, allow for hundreds of different connection combinations for voice, data, audio, video, and RF—making them a superior choice for unique system configurations. Each coupler features nickel plating (gold plating on the banana jacks) for corrosion resistance, and the same connector type on both each side of the keystone. A four millimeter banana plug entry and five millimeter speaker wire entry ensure compatibility with a wide variety of speaker cables and banana plugs.