RLC variable attenuator, 0-12dB in 1 dB steps DC to ~1 GHz TESTED see data plots
Exact item shown, tested to 3 GHz, as you can see, it’s pretty good to 1 GHz, not awful to 1.5 GHz and pretty wild as you push pass two GHz – the last photo shows the internal construction, the line length (not shown) is resonating at the higher frequencies and becoming much more than a wire.