Annengjin TAIDEA 1000/3000 Grit Combination Corundum Whetstone Knife Sharpening Stone/Double-Sided Equipped with a silica gel non-slip base for safety sharpening Double sided sharpening Corundum whetstone 7" x 2.4" x 1.1" (180mm x 60mm x 27mm) Premium grade corundum ensures effective sharpening results