150mm (6") Fine diamond sharpening stone

400 GRIT: This 150mm (6") fine (400 grit) diamond sharpening stone is ideal for refining the cutting edges of plane irons and chisels or for honing tungsten carbide tipped (TCT) router cutters. DURABLE AND EASY TO USE: Extremely tough, it does not require oil lubrication, only water, for quick, easy and effortless sharpening.