It is also referred to as a whetstone. Oil stones come in a wide range of shapes, sizes, and material compositions. They may be flat, for working flat edges, or shaped for more complex edges. The reason they are called oil stones is because the lubrication of choice for users is mineral oil. Mineral oil is an ideal candidate for sharpening because it is light and does not harden or go rancid. A light oil is desirable because a heavy or viscous oil will interfere with the sharpening action of the stone. The difference between mineral oil and honing oil is viscosity.

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