Japanese Diamond Sharpener Review

Useful but has limits.

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At a Glance

With coarse and semi-coarse surfaces, this narrow file is most useful for restoring dull or damaged pruning tools.

Where to Buy

Recommended: Hida Tool
Alternate: Amazon (similar)

Review Summary

Tool Merchants’ Take

4 out of 5 stars

User Reviews

0 out of 5 stars

Overview

One side of this diamond coated file is an extra coarse 120 grit for initial sharpening or repairing a damaged blade. The second side is a coarse 300 grit for finishing your blade with a toothy edge, or as a middle step before moving onto a finer grit stone or carbide.

The thin, narrow file can repair damaged or dull pruners and loppers, but it is also useful for hoes and other garden tools The diamond cutting surface should last a very long time, and can sharpen very hard steels that a common file cannot.

Note 1:  Unless your pruners or loppers are extremely dull or damaged, do not use this file, it is too coarse.  For moderately dull, undamaged cutting tools, we recommend a carbide sharpener, compact sharpening stone, or small diamond plates.

Note 2:  This sharpener requires a break-in period before it cuts at its smoothest.  In other words, it will leave a rougher edge the first few times you use it.  For this reason, we recommend you begin by sharpening your less fine tools, such as garden hoes, before moving onto pruners, loppers etc.

  •  4″ file surface, 8.25″ overall
  • Diamond coated steel, polymer “handle”
  • Double sided:  120/300 grit
  • Made in Japan
Japanese Diamond sharpener with Pruners
Japanese Diamond sharpener with Sharpie 2

My Take

I don’t reach for this file very often, but when I need it I’m glad it’s available.

Its thin and narrow size make it ideal for sharpening pruners and loppers, but it’s so coarse that I only use it on very dull or damaged tools.

It works well enough for other garden tools, but due to its small size, I prefer to use an eight to twelve inch mill file instead.

Where to Buy

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