Round Diamond Needle File 150 GritProduct Details1.Mini diamond file for fine detail work. Suitable for shaping and polishing metal, wood, marble, stone, plastic.2.Electroplated diamond has fine grains, high hardness and good wear resistance (hardness: 62-67 HRC).3.Total Length: 180mm / 7-inch; File Length: 70mm / 2.8-inch; Diamond Grit: 150; File Type: Round.4.Non-slip plastic dipped Handle for easy and comfortable grip5.When using the file, it should not be too fast. For long-lasting use, please use a lubricant (such as water) when using diamond needle files.