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I think mine are a 180 and 325. The 325 gets sticky with suction quite easily and I most often use the 180 but they both work well.

I am not sure above ut buying in Europe, I got mine from...

I see a DMT lapping plate. You should get a DMT bench hone. They are a little smaller and at 8x3 they fit nicely into the rubber base hone holders, which make them a little easier to use. I use...