Ferrite snap-on noise filter. Black plastic case with split core material. Clamps around cable up to 5mm Dia. and blocks noise.
Frequencies from ~10MHz to above 500MHz.
Impeadance: ~50 ohm @ 10-100MHz
~100 ohm @ >100MHz
L: 1" (25mm) DIA: 1/2" (13mm) WT: .01