Ferrite snap-on noise filter. Black plastic case with split core material. Clamps around cable up to 13mm Dia. and blocks noise.
Frequencies from ~10MHz to above 500MHz.
Impeadance: ~30 ohm @ 10-100MHz
~75 ohm @ >100MHz
L: 1-7/16" (36mm) DIA: 29/32" (23mm) WT: .06