Why are there two formulas for stainless steel marking drilling?

There are two reasons why the formula of stainless steel marking drilling hole is different in use. According to relevant information, the length of the safety net is 240 cm. 240 divided by 12 is 20. Then draw a line and measure the length with a tape measure. Draw a line every 12CM and take a sample. Compare the material to be drilled with the sample, compare it with a square and draw lines all over the body. Remember to mark the better end, so as not to enter the round tube in the wrong direction when welding.