CBN ist the best suitable grain for grinding hardened steel: You will hardly generate a high temperature, because CBN has an extremely good conductivity for temperature, so the heat generated is dispersed quickly. This is also helped by the shape of the metal body of the wheel. No more blues.

The wheels have an extremely long working life with an excellent rate of stock removal. The face will stay flat, no dressing and shaping necessary.

They will produce just the right cutting edge for turning tools.