Atoma Advanced Diamond Sharpening Plate #400 Grit

Sale price$124.00 Regular price$144.00
  • Atoma Advanced Diamond Sharpening Plate #400 Grit
  • Perfect for flattening dished whetstones
  • Can replace traditional whetstones up to 500 grit
  • Remains flat and lasts for an extended period
  • Ideal for general whetstone flattening and high polishing grits
  • Made by Tsuboman, a reputable Japanese manufacturer

The Atoma Advanced Diamond Sharpening Plate #400 Grit is a versatile tool designed to flatten dished whetstones and replace traditional whetstones up to 500 grit. It offers the perfect balance between coarse and fine grit, making it suitable for a wide range of sharpening tasks.

Compared to traditional whetstones, the main advantage of using an Atoma plate is its ability to remain flat over time, providing consistent performance and longevity. The Atoma #400 is a staple grit for general whetstone flattening, covering a range from low grits to high polishing grits.

To use the plate, mount your whetstone in a stone holder and rub the Atoma plate on top of the whetstone in various directions until the stone is effectively lapped.

Atoma Diamond Sharpening Plates are products of Tsuboman, a highly regarded Japanese manufacturer known for their refined diamond products. These plates are made of mono-crystalline diamonds with a cutting abrasive surface mounted on a 10mm thick stainless steel base. The base is machined to be extremely flat, ensuring the diamond plate remains flat throughout its use.

The quality and durability of Atoma plates are among the highest available on the market. They feature precision-made surfaces with high uniformity, maintaining their flatness even after prolonged sharpening sessions. The diamond plate can be replaced after a few years without purchasing another baseplate, as they are adhered using strong double-sided tape.

Atoma Diamond plates can be used dry or with water, depending on personal preference.

  • Brand: Tsuboman Atoma
  • Grit: #400 (mounted to Stainless Steel)
  • Size: 210 x 75 x 12mm
  • Weight: 750g
  • Storage pouch included
  • Professional Sharpening Stone / Diamond Plate
  • Made in Japan

After use, it is important to thoroughly clean the plate and remove any water if used during sharpening. Allowing the plate to dry fully will prevent rusting and maintain its longevity.

 The Importance of grit progression


  • FREE Standard Delivery Over $200
  • FREE Customer Pick-Up (Syd Only)
  • Same day dispatch until 2PM AEST (Mon-Fri)

Delivery Area

Sydney, Wollongong, Newcastle, ACT, Central Coast, Adelaide
Melbourne, Geelong, Ballarat, Bendigo
Brisbane, Sunshine Coast, Gold Coast, Hobart
Perth, Darwin
Rest of Australia


2-4 Days
2-4 Days
2-4 Days
5-10 Days
7-12 Days


Next Day
Next Day
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3 Days
5 Days


Same day dispatch until 2PM AEST (Mon-Fri)

*Delivery estimates provided by Australia Post

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Customer Reviews

Based on 19 reviews
Timothy Cave
Atoma Advanced Diamond Sharpening Plate #400 Grit

Product arrived within two weeks to rural destination in Victoria. Product looks as to be expected. Only criticism is that the instructions for use are not in English (Japanese?). I found videos for use and upkeep available on Utube.

Daryl H

Good Size and Easy to Handle

Dennis R

Well worth the price

Gregory L

Good build quality

Mark L

Chisel is like brand new!

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