This is a new item. I received it from a friend, but I have no use for it, so I am selling it. This is an oil stone to be used by soaking it in oil such as kerosene or grinding oil. It is made of A abrasive grains and has a wide range of grain sizes, high stone strength, and is resistant to shape deformation. It is suitable for removing gasket residue and burrs from cylinders (cast iron), etc.