KinpsTAIDEA 400/1500 Grit Combination Corundum Whetstone Double Knife Two-sided Sharpening Stone (400#/1500#) High-grade corundum ensure effective sharpening results Double-sided sharpening design(400 grit coarse grinding and 1500 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.