《天工开物·中篇·锤锻》
每种锉刀都有不同的用处，开锯齿时先用三角锉，然后使用半圆锉；修平铜钱时用方长牵锉；加工锁和钥匙等工具时要用方条锉；加工骨角时使用剑面锉，也就是朱熹在《大学》中注解中提到的所谓 锡 ；加工本器时则会用到香锉这种锉的锉面上没有成排的纵、斜纹，而是锥上了许多细小的圆眼。
凡鎈开锯齿用茅叶鎈，后用快弦鎈。治铜钱用方长牵鎈，锁钥之类用方条鎈，治骨角用剑面鎈。治木末则锥成圆眼，不用纵斜文者，名曰香鎈。
Each file has a different purpose. Use a triangular file first when opening the saw teeth, and then use a half-round file; use a square file when leveling the copper coins; use a square bar file when processing tools such as locks and keys; use a sword file when processing bones and horns, which is the so-called “xi” mentioned by Zhu Xi in the annotation of “The Great Learning”; When processing the device itself, you will use the incense file. There are no rows of vertical and diagonal patterns on the file surface of this file, but many small round eyes are tapered.