The Lansky 10 Extra Coarse Sharpening Hone is a high-quality sharpening tool designed to tackle extremely dull blades. Its extra coarse diamond surface allows for fast cutting, making it ideal for starting an edge on severely worn knives. The hone features a slip-resistant finger groove, providing a secure grip during use. This product is part of the Lansky Sharpening System, which includes color-coded holders for easy identification. The holder itself is embossed with the grade of stone, ensuring you can quickly identify the correct sharpening surface. With fast shipping, you can get started on sharpening your blades right away.Product Features and Specifications: Material: Highest quality material Manufacturer: Lansky Sharpeners