Annengjin TAIDEA 8000 Grit 7-Inch Professional Knife/Razor Sharpening Stone/Single-Side Corundum Whetstone High-grade corundum ensures effective sharpening results. Equipped with a silica gel non-slip base for safety sharpening. 7" x 2.4" x 0.6" ( 180*60*15 mm). Widely used in various knives and tools including kitchen knife, pocket knife, etc. CANNOT be used for ceramic knife, scissors and serrated knife.