EMERY: The main ingredient of this product is silicon carbide, which has high toughness and hardness, corrosion resistance, wear resistance and durability. Electroplating process: the diamond is firmly fixed on the file, the sand is fine, the surface is smooth, and the high temperature resistance is strong. COMFORT HANDLE: It has a soft rubber grip, a non-slip granular design, easy to hold and will not get tired when used for a long time. High durability. PERFECT KIT: You can get 10 different shapes of needle files, stored together, easy to carry. Application: widely used in different shapes, models, parts, handicrafts and other industries, such as: jade, ceramics, glass, crystal, carbide and other components, grinding, polishing, engraving, cutting, drilling, patching, etc.