12in Round Mill Steel File Rasp with Handle Sharpening Shaping Tool for Metal ProjectsMiddle Teeth File Condition: Item Type: Round File Material: T12 Carbon Tool Steel+PP+TRP Color: As shown in the picture Full Length: Approx.41cm/16.1in File Blade Length: Approx.300mm/12in Thickness: Approx. 10.5mm/0.41in Weight: Approx.292g/10.3oz Application: For steel iron File Texture: Single texture Cross Section Shape: Round Function: Fitter file according to the size of file teeth can be divided into coarse teeth file, middle teeth file, fine teeth file. 1. If the workpiece to be processed is low carbon steel, coarse teeth can be used. 2. For medium and high carbon steel, use medium teeth. 3. Fine teeth can be used for shallow surface finishing. 4. According to the material type of the workpiece to be processed, choose the appropriate file, which not only saves labor and time, but also prolongs the service life of the file.