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I'm looking to purchase a coax to waveguide adapter and noticed some of the adapters have rounded insidesfound here: https://www.sagemillimeter.com/wr-42-waveguide-to-k-f-coax-adapter-right-angle/while other have the square inside that I'm used tofound here: https://www.sagemillimeter.com/wr-28-waveguide-to-k-f-connector-adapter-right-angle-thermal-vacuum-safe/Does anyone know what the major difference is between these two?