Specification of file: the specification of file is divided into two kinds: one is the size of file. This specification: for square file size specifications to square size, round file size specifications to diameter size, other files to file length, common file length of 100-400 mm many specifications. The two is the specification of file size. This specification specifies that the number of stripes per 10 mm axial length of the file with the main filing is indicated, the main filing refers to the main cutting role on the file of the tooth lines; and the other direction of the cutting role of the tooth lines, called auxiliary tooth lines. The file size of the file is selected as shown below.
Selection of file profile 粗齿锉刀用于加工软材料，如铜、铅等或粗加工；
Rough file is used for processing soft materials, such as copper, lead or rough machining.
The fine tooth file is used for machining hard or fine machining.
The optical file is used for the last finishing surface.
Each file has its main purpose and should be selected according to the shape and size of the workpiece.
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