Search:

if you try doing full lapping with the 600 you will probably see the diamonds dissapear from the plate fast
I use the DMT 220 on all my naniwas and the only ones that is not smooth is the 1k and 3k...

two first can both be used
last one dont come in coarse
if i was laping anything harder then nanivas i would get XC or XXC as 220 or 120 grit

oh and the perforated one may be a little faster for...