[TVI-RFI-EMI] what frequencies are these ferrites best for

[bill]

I see these on eBay in various sizes
the SKU is ZCAT2032--0930

but from looking at a few datasheets, I can't determine if these would 
be appropriate for ham radio rfi suppression?

Please and thank you

-- 

Aw, how could he (Jorge Orta) lose the ball in the sun, he's from Mexico.-Harry Caray
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W9OL-Bill H. in Chicagoland
webcams at http://w9ol-towercam.webhop.org:8080
My weatherpage at http://home.comcast.net/~w9ol/WX/HH.htm