Mini Whetstone Can be used to hone and sharpen steel, ceramics, glass and tungsten carbide etc. Size: 70 x 25 x 5mm. Made with real diamond (monocrystaline). Easy to use - requires only light pressure to produce a keen edge. Uses water as a lubricant. Can be used to hone and sharpen steel, ceramics, glass, tungsten carbide, stone, etc.