SE SS126 6-Piece Silicon Carbide Sharpening Stone Dimensions (inches): 6 x Material: Green Silicone Carbide Sharpening Stone Grit: 240 Shapes include: Square, Rectangle, Triangle, Knife, Circle, and Half Circle Versatile Shapes Provide the Best Sharpening of Knives, Hooks, Scissors, Gravers, Blades, Chisels, Etc.