R21 Inner Diameter 21mm Grinding Round Cup Type Grinding Polishing Diamond Bit

R21 Inner Diameter 21mm Grinding Round Cup Type Grinding Polishing Diamond Bit
See other listings here → #MaruCup #MaruCupR
Specifications: Coarse grit
Shank Diameter: 6mm
Outer Diameter: Inner Diameter + 1mm
Compared to cup types with 2.35mm or 3mm shanks, these are closer to a perfect circle, making them ideal for stone working, jewelry processing, and hobbies such as creating stone bracelets or prayer beads, allowing you to achieve a beautiful rounded shape.
Please use water to prevent overheating.

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