This is a hard rock. It is NOT intended for removing large amounts of material, but for finishing (sharpening) an already sharp blade. No whetstone is easy to use; A slight tilt of the blade can negate several minutes of careful sharpening. But for its size. I use it to sharpen blades in the workshop and in the field; it fits in my pocket and is always there when I need it. For serious multi-blade work it's not the best choice, but for re-sharpening a blade that has become less sharp with use it's great not having to go back to the store to buy the big stones, that I use there.
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