High quality material: Forged with high quality bearing steel, quenched at high temperature, with high hardness and wear resistance. Not easy to break teeth / sharp file / strong and durable / beautiful and elegant. [Clear grain] Clear surface, wear resistant, high cutting efficiency and good finish. [High carbon steel file] High quality carbon steel file, hard characteristics, not easy to deformation. [Overmolded handle] Made of high quality plastic, ergonomic design, comfortable grip. [Tight connection] The handle is wrapped with frosted surface as a whole, not easy to fall off, long service life. [Various shapes] Including 10 kinds of shapes of files, can easily meet various needs. [Wide range of uses] Used for hard material processing, quenched material processing, glass product processing, mold polishing, deburring, edge trimming and chamfering, clock and watch repair, jewelry polishing processing, wood polishing, bearing mold refinement, etc. [Use rule]Use one side of the new file first, when the side is dull, use the other side, when cutting file, use the wire brush to remove the chips on the file teeth frequently. Note that the files should not be stacked together. Product specification: Material: steel. Cross-sectional shape: 10 different kinds of shape. Width/thickness/diameter: 140mm (5.51inch). Use: steel, wood, model. Size: 3*140mm (0.12*5.51inch).