Estone 10000# Knife Razor Sharpener Stone Whetstone Polishin Oilstone Grit 50mm A fine-grained whetstone lubricated with oil,used for fine sharpening Mainly applied in instrument industry,Precision parts,micro cutting tools,precious stone,Measuring tool,Hard alloy, etc Its extremely hard,maintain their shape well and are resistant to wear For polishing,sharpening Each package with a cell phone chain Which has "Estone" LOGO