The Atoma Diamond Plate (Base + Diamond Sheet) by Tsuboman is a professional-grade diamond sharpening tool.
Built on a perfectly flat aluminum base with precisely bonded industrial diamonds, it delivers fast, consistent, and reliable sharpening performance that traditional whetstones cannot match.
While it can be used directly for sharpening, many users primarily rely on the Atoma as the most effective tool for flattening whetstones, from coarse to fine finishing stones.
The plate design is replaceable: simply attach a replacement sheet to the base for long-term use.

Size: 210 × 75 × 12 mm
Weight: 595 g

Specifications — Tsuboman Atoma Diamond Stone (by grit)

#140

• Usage: Heavy grinding and stone flattening

• Recommended for: Very coarse whetstones (#120–#400)

#400

• Usage: Standard stone flattening

• Recommended for: Medium-coarse whetstones (#400–#1000)

#600

• Usage: Fine flattening and light sharpening touch-ups

• Recommended for: Medium to fine whetstones (#1000–#3000)

#1200

• Usage: Precision flattening and fine surface preparation

• Recommended for: Finishing whetstones (#4000 and above)