1SHARPENING SET: Double sided sharpening stone set for all metal blades, often used for sharpening and polishing the dullest blades, efficient and durable. 2FLATTENING STONE: Any sharpening stone will naturally grow unevenly over time, the flattening stone will keep your stone flat, which has good practicality. 3MAIN PURPOSE: 400/1000 grit sharpening stone is used to sharpen edges by raising burrs, polished with fine grained 3000/8000 grit sharpening stone. 4OTHER ACCESSORIES: Equipped with angle guide rails and bases, convenient to fix the stone and avoid random sliding, and the rubber pads are used for non slip. 5EASY OPERATION: Professional sharpening stone combination kit, which has fine workmanship, compact structure, easy operation and wide application range.