I am a BIG WD fan. Buy it by the case! :)
Is there a progression of Arks? Seems there are a lot of finishers which can redefine sharp.
I see the black ones too?
Funny, as a synthetic user for the most part, I flush and lap away the black swarf.
Ark guys want to embed it into the hone! Neat! :)
I suppose they don't need lapping very often?