Lanskyand#39;s Diamond Benchstones are designed for expert knife and tool care. All Lansky Diamond Benchstones feature a full edge-to-edge diamond grit surface for quicker, more efficient sharpening. Lanskyand#39;s Diamond Benchstones feature a high-impact plastic self-storing case that raises the stone as shown to the left for maximum safety and comfort. The bases come with non-slip feet and an overmolded rubber frame.? This stone is Fine.