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2026-11-06
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F21 Inner Diameter 21mm Grinding Round Cup Diamond Bit
$13.38
$17.3940001487732
30% OFF
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Product Details
Description
Specifications
Care Guide
F21 Inner Diameter 21mm Grinding Round Cup Diamond Bit
See other listings here → #まるカップ #まるカップF
Specifications: Fine grit
Shank diameter: 6mm
Outer diameter: Inner diameter + 1mm
Compared to 2.35mm and 3mm shank cup types, these have a more perfectly round shape. They are ideal for stone working, jewelry processing, and hobbyists creating stone bracelets or prayer beads, allowing for a beautiful rounded finish.
Please use water to prevent overheating.
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Category
Whetstones
Condition
New/unused
Shipping
Included in price (by seller)
From
Niigata
Daily Cleaning: Use a soft brush or damp cloth to gently wipe away dirt. Avoid harsh chemicals. For mesh areas, use diluted mild detergent and a soft brush.
Drying: Air dry in a cool, shaded place after cleaning. Avoid direct sunlight or high heat, which can cause fading and glue deterioration.
Storage: Stuff with paper to maintain shape when not in use. Store in a dry, ventilated area to prevent mold. Rotate between multiple pairs to extend lifespan.
Usage Notes: Designed for basketball. Not recommended for hiking, long-distance running, or other specialized sports where different performance features are required.