Here is a Ka band(26-40 GHz), WR-28 waveguide, standard flange, variable waveguide attenuator, made by Waveline, model 1022, 0-60 dB. Works fine, shows its age but nicely made and in good shape. Intersting that Waveline made it go 10 dB more (60 dB) than HP( only 50 dB).