《天工开物·中篇·锤锻》
用斧头敲击凿柄，凿子的刃就能方便插入木料而凿成孔。凿子的刃宽的一寸，窄的约三分。
斧从柄催，入木透眼，其末粗者阔寸许，细者三分而止。
Use an axe to hit the chisel handle, and the blade of the chisel can be easily inserted into the wood to make a hole. The blade of the chisel is one inch wide and the narrow part is about three points.