Atoma 400 Diamond Sharpener Medium
- 400 grit, medium rough
- Diamond sharpening surface
- 8 x 2.77 x 0.32 inches, flat plate
- 1.3 pounds, gray
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A bare diamond plate for hand sharpening. The listing names no base, holder or tool types, so it suits users who already know their setup.
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ASIN: B0031KNR2OModel: 400Category: Knife Sharpeners
Overview
Someone sharpening by hand gets a slim flat diamond plate in a medium rough grit. Diamond abrasive cuts steel quickly, and the slim body is a bare plate with no stated handle or base.
This middle grade falls between a coarse reprofiling stone and a fine finishing stone, which makes it a working grit for dull edges. The plate is thin and heavy for its size. The listing says nothing more about use.
Who it's for
Users who already have a bench setup or a mounting block will use the plate as a medium grit step. Buyers looking for an all-in-one sharpening kit, or one with finishing grits, should choose a set.
Pros and cons
- Diamond surface cuts quickly
- Medium rough grit for dull edges
- Slim flat plate
- Weighty feel on the bench
- Base or holder not listed
- Single grit only
- No instructions in the listing
Performance notes
Grit number decides how fast metal comes off and how rough the scratch left behind is. A medium rough diamond plate removes steel quickly, which suits dull edges before a finer step. Its flat face and thin profile need a firm support underneath.
Specifications
| Brand | Atoma |
|---|---|
| Model | 400 |
| Dimensions & fit | |
| Item weight | 1.3 pounds |
| Item Dimensions L x W x H | 8 x 2.77 x 0.32 inches |
| Size | 8" x 2.77" x .32" |
| Construction & materials | |
| Color | Gray |
| Other details | |
| Grit Type | Medium rough, 400 |
| Abrasive type | Diamond |
| Grit | Medium Rough #400 |
Frequently asked questions
Does the Atoma 400 diamond sharpener include a base or holder?
The listing describes a plate by grit, type and size and names no base, holder or handle. Treat it as a bare plate.
What grit is the Atoma medium diamond sharpener?
The seller copy lists it as medium rough, number 400.
How large is the Atoma 400 diamond plate?
It measures 8 inches long, 2.77 inches wide and 0.32 inches high.