Can be used on stones up to and including Mohs hardness 4 (Carrara marble) Bick processing group 3
The hand-cut fluted graters by BICK Art Supplies are made in Italy. The ends with which you grate are provided with hand-cut teeth. The graters are made of locally hardened carbon steel. After the teeth are cut, the carbon steel of the rasp is hardened at the ends.
For a long life, it is advisable not to throw the graters on top of each other. They are all hard and will therefore blunt each other if used incorrectly. Prevent this quality tool from rusting, which also causes it to lose its sharpness. After use, clean thoroughly with a brass brush and spray with a non-greasy preservative (e.g. WD40). Do not use a wire brush, this will also dull your graters faster!