Ferrite snap-on noise filter. Black plastic case with split core material. Clamps around cable up to 11mm Dia. and blocks noise.
Frequencies from ~10MHz to above 500MHz.
Impeadance: ~50 ohm @ 10-100MHz
~100 ohm @ >100MHz
L: 1-3/8" (35mm) DIA: 3/4" (19mm) WT: .05