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These WR28 WR34 & WR42 Microwave Waveguide to Coax adapters come with either 2.92mm connectors or SMA connectors, depending upon frequency. The WR28 Waveguide to Coax Adapters mate with UG559/U and UG559/U-Al Flanges. The WR34 parts mate with UG1530/U and UG1530/U-Al Flanges. Our WR42 Waveguide to Coax Adapters mate with UG597/U, UG595/U, and UBR220 Flanges.