Question 1

The dimensions are stated as 25 x 22.5 x 3.5 cm. This doesn't look right to me. Could somebody please check? Thanks.

Accepted Answer

The ones I bought measure the following 152mm long (15.2cm)  50mm (5cm) wide and 3mm thickness. The dimensions stated do not match the product advertised. Hope this helps. Great product though.
Kind regards

Question 2

Can you use it for ceramic knife ?

Accepted Answer

Not sure if this will help, the problem with sharpening ceramic knives is the ceramic blade is very brittle, if you apply too much pressure to the side of the blade it could easily snap. If you still want to try you will need a diamond sharpening stone with a hardness of at least 10. Hope this is of some help.

Question 3

Should I use oil or water as a lubricant with this type of sharpening stone? If yes, which? Thanks.

Accepted Answer

These stones can be used dry or with water. Using water helps remove small particles from the sharpening surface, and gives a smoother sharpening in my opinion. I use water with a few drops of window cleaner in a spray bottle, which seems to work just fine. Be aware that the metal surface that the diamond dust is attached to may rust a little when using water on it, so cleaning and drying the surface after use is a good idea. For the money I think this is a great and very useful little kit that I use for sharpening chisels and planer irons with really good results.

Question 4

Can someone tell me what grit they are?  Thanks

Accepted Answer

They don't have that information marked on them. Any reply would just be a guess. Sorry. If you need a specific grit then you probably need a better product. These are perforated sharpening 'plates' mounted on coloured plastic backing and are 'cheap 'n cheerful' rather than professional quality.

ASIN	B000LPDNLW
Best Sellers Rank	206,273 in DIY & Tools ( See Top 100 in DIY & Tools ) 216 in Sharpening Stones 310 in Manual Knife Sharpeners
Brand Name	Blue Spot Tools
Colour	Blue
Customer Reviews	4.3 4.3 out of 5 stars (791)
Global Trade Identification Number	05028734192759
Grit Type	Extra Fine,Fine Grit,Coarse Grit,Fine
Included Components	150mm x 50mm Whetstones: Extra fine grit, Fine grit & Coarse grit
Item Dimensions L x W x H	9.8L x 8.9W x 1.4H centimetres
Item Type Name	Diamond Sharpening Whetstone Set
Item Weight	0.51 Pounds
Manufacturer	Blue Spot Tools
Manufacturer Part Number	19275
Material Type	Stone
Model Number	19275
Number of Items	3
Number of Packs	1

Blue Spot Tools Diamond Sharpening Whetstone Set, 3-Piece (Extra Fine, Fine, Coarse Grit, 6 x 2-Inch, Blue)

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