DIAMOND MATERIAL: These diamond needle files are made of high quality metal, strong, compact and durable for a variety of polishing, with excellent workmanship, bringing fast cutting and high efficiency. EQUIPPED ANTI-SLIP HANDLE: This diamond needle file is equipped with a non-slip handle with a comfortable grip. Each part of the polishing file is covered with soft plastic, comfortable to grip and non-slip. WEAR AND CORROSION RESISTANCE: These diamond needle files have superior performance in wear resistance, corrosion resistance and high temperature resistance. So it is very safe, you can buy it with confidence. COMPATIBLE USE: These diamond needle files are mainly used for super hard, very blunt and serrated knife gripping tools, mainly used for grinding large occasions. And it can meet most people's needs. A PERFECT CHOICE: These diamond needle files are an excellent choice for fast, safe and smooth filing and grinding. And it is used in processing steel, ceramics, glass, bearings, molds, gears and other parts. Note: The data is all measured manually. Please allow 1-3cm error. Due to the difference between light and display, there will be a certain color difference, which is subject to the actual object received