In article
,
Dave Hill writes
I realy don't know, like you I am thinking about buying, but I
wouldn't go for very fine for garden use

Three diamond grits are available.Medium (400 grit) for fast
sharpening where a high finish quality is required .Fine ( 600 grit)
that has the ability to sharpen a dull knife in less than a minute and
bring the edge to a razor sharp finish.


Might go for fine then!
--
Janet Tweedy
Amersham Gardening Association
http://www.amersham-gardening.net