It is made of 'diamond particle coating, with high hardness, sharper and faster polishing, durable and practical, and long service life. The base body is made of high-strength, high-manganese steel, which is integrally formed and thickened, which is not easy to deform and break, safe and efficient. Used for engraving, polishing, precision grinding and internal grinding of cast iron, stainless steel, carbide, ceramic, glass, jade, marble, quartz, stone and other hard and brittle materials. Universal round handle design, stable clamping without slipping, suitable for installation in electric hand drills, rechargeable drills , cutting machine, engraving machine. High wear resistance, high precision grinding technology, less dust during grinding, more environmentally friendly and high efficiency. Specifications: Material: Diamond coating. Shank Diameter: 6mm/6.35mm/20mm. Package included: 1 x Diamond Router Bits. Note: It is not recommended to use on low hardness materials such as wood, copper and alloys aluminum. ladaceae