Whetstone, Kinps 3000/8000 Grit Combination Corundum Double Knife Two-sided Sharpening Stone High-grade corundum ensure effective sharpening results double-sided sharpening design(3000 grit coarse grinding and 8000 grit fine grinding). Equipped with silica gel non-slip base guarantee the safety sharpening. Usually used in a variety of knives and tools including kitchen knife, pocket knife, woodworking tools and garden tools etc. Cannot be used for ceramic knife, scissors and serrated knife.