This complete knife sharpening set comes with a double-sided (400/1000, 3,000/8,000) in premium quality sharpening stone, a bamboo base for holding of the stone and a knife sharpening angle guide.The angle guide for sharpening of the knife allows you to maintain the correct angle and apply an uniform pressure while sharpening the blade.This grinding set for water stonesis extremely user-friendly and easy to install.As it is made of white corundum, no expensive oil is required. Simply use a little water and you're ready to go. Specifications: Material: white corundum Shape: rectangle Size: 8.7*3.9*3.9 inch / (22 * 10 * 10 cm) Weight:1.8kg Particle size: 3000 8000 mesh, 400 1000 mesh. Application: household kitchen knife, dark knife stone, outdoor grindstone, sushi knife. Features: Good self sharpening, strong toughness and fast grinding. Special proportion of white corundum sintered, not only hardness and wear-resistant, but also strong grinding force, fine texture, ensure the grinding speed and quality. Material composition: the material is obtained by high temperature crystallization at 1700 and ball milling, flotation and pickling, and then sintered at high temperature after molding by mixing materials. Installation Steps: Soak the grindstone in water for 15 minutes. Sharpen the knife according to the order of coarse to fine. Don't scrape off the mud after sharpening. The water can sharpen it. Attention: Make full use of the whole surface of the grindstone to keep the consistency of the grindstone surface. Pay attention to protect the grindstone in use to avoid falling from high places. Please do not put the grindstone and knife in the place easy to reach by children to avoid accidents. Packing list: 1 x Grindstone set / 1 x Millstone suit with base