- Moldmaker stones consists of a harder black silicon carbide abrasive that breaks down faster than aluminum oxide.
- Cuts faster due to the sharpness, hardness, and friability of the abrasive grain.
- This stone is used for ductile metals; ideal for softer tool steels and non-ferrous metals.
- Hard and Soft tool steels as lows as Rockwell C 25, and soft non-ferrous metals such as Aluminum and Beryllium.