GBN-B8100

Black crystal, irregular shape, good fragility, easy to break down. These characteristics guarantee great grinding efficiency, and thus it is applicable for resin and vitrified bond tools.

GBN-B8200

Black crystal, most in semi-blocky, medium toughness, good thermal stability. It is used for resin and vitrified bonded tools of relatively strong impact application.

GBN-B8300

Black crystal, regular shape, most in blocky shape, high toughness, and excellent thermal stability. B8300 is primarily for metal and vitrified bond tools.