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.

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

Can you use it for ceramic knife ?

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.

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

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.

Can someone tell me what grit they are? Thanks

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.

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🔪 Sharpen smarter, not harder — stay ahead with Blue Spot precision!

COMPACT PORTABLE - 6 x 2-inch stones fit perfectly in any tool kit or drawer
DURABLE BLUE STONE - High-quality stone material built to last through countless sharpening sessions
TRIPLE GRIT MASTERY - Coarse, Fine, and Extra Fine stones for every sharpening need
MESS FREE SHARPENING - Water lubrication means no oily residue, keeping your workspace clean
PRECISION EDGE CONTROL - Designed for small hand tools, delivering razor-sharp results every time

The Blue Spot Tools Diamond Sharpening Whetstone Set includes three 6 x 2-inch stones with coarse, fine, and extra fine grits. Designed specifically for quick, oil-free sharpening of small hand tools using water lubrication, this durable blue stone set offers precision and convenience for professionals and enthusiasts alike.

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Manufacturer	Blue Spot Tools
Part Number	19275
Product Dimensions	9.84 x 8.86 x 1.38 cm; 231.33 g
Item model number	19275
Colour	Blue
Material	Stone
Item Package Quantity	1
Number of Pieces	3
Grit Description	Extra Fine,Fine Grit,Coarse Grit,Fine
Included Components	150mm x 50mm Whetstones: Extra fine grit, Fine grit & Coarse grit
Batteries included?	No
Batteries Required?	No
Item Weight	231 g

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

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