Hapstone Premium CBN

These stones are superb. I love the binder as it helps them leave a nice scratch pattern, provide great feedback and not be so harsh as to cause carbide pullout. All in all they will sharpen anything and excel at the toughest jobs like Hap40, Rex121, Maxamet and Magnamax. They require just a little infrequent cleaning with a lap or two with a nagura. I used mine right out of the box, a purist might give them a pass or two over a glass plate with some SiC powder.

Stone works great even for straightening out the S90V factory edge on my pm2!

Great stone! Sets a fine mirror polish. Definitely recommend.