The Katana Saya Rough/Medium 240/1000 Grit Sharpening Kit provides everything you need to keep your Japanese knives in peak condition. This professional-grade kit features a combination whetstone with two distinct grit levels: 240 grit for repairing and reshaping the blade edge, and 1000 grit for routine maintenance and regular sharpening. By using the appropriate side of the stone based on your knife's condition, you can restore the blade's sharpness and refine the edge for continued cutting performance.The 240 grit side is ideal for more extensive sharpening tasks, such as repairing damaged blades or reshaping the cutting edge. It is perfect for knives that have become dull or have chips along the edge. This coarser side allows you to regrind the blade's angle, restoring it to its original sharpness. The 1000 grit side is best used for regular, routine sharpening. It refines the blade after using the 240 grit, providing a smoother finish and maintaining the sharpness for consistent use.