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.

Great product as always and shipped out fast.

I have tried Naniwa stones, Shapton glass stones, and various water & diamond stones in the past. Although these stones were sufficient, the PDT diamond & PDT CBN sharpening stones are superior. I used the 160 & 550 grit PDT diamond metallic bonded sharpening stones to profile the edge which was quick & precise. The 1000 grit PDT CBN resin bonded sharpening stone had a better feel and did not leave the scratches like the diamond stones. While these sharpening may cost a little more money than similar stones it is well worth the money.