Lansky’s Diamond Bench Stones are designed for expert knife sharpening and woodworking tool care. All Lansky Diamond Bench Stones feature a full edge-to-edge diamond grit surface for quicker, more efficient sharpening. They are available in two sizes and five grits. Lansky’s Diamond Bench Stones 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 rubber frame. Grit Guide: Extra Coarse (70 grit), Coarse (120 grit), Medium (280 grit), Fine (600 grit), Extra Fine (1,000 grit)