size makes it hard to draw large blades uniformly over them, especially "in the field", are called pocket stones.

Often whetstones are used with a cutting fluid to enhance sharpening and carry away swarf. Those used with water for this purpose are often called water stones or waterstones, those used with oil sometimes oil stones or oilstones.

Whetstones will wear away with use, typically in the middle. Tools sharpened in this groove

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