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Tools Accessories - Jigsaw Blades-Rotary Rasps/Files - Mini Drill / Grinder Tools

The hard stones are subdivided according to the degree of hardness from 1 - 10. Tungsten carbide can be used up to hardness degree 6. Drilling hard stones with a hardness degree of more than 6 calls for the use of diamond tools.

 

Grinding rule:

soft materials = hard grinding bits;

hard materials = soft grinding bits!

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