How to drill the aperture of sewer pipe with stainless steel plate

underline first and then punch.

1. Draw a line at the punched place to make a small hole;

2. Then drill holes with a rocker.

according to the definition in GB/T2878-27, Stainless Steel is a steel with stainless and corrosion resistance, and the chromium content is at least 1.5% and the carbon content is not more than 1.2%.

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