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ppr fittings-NF-4011-Newsun Industry Co., Ltd
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How to make a square hole

But this method has a small regret, that is, there are small arcs at the four corners.
 
By improving the equal width curve, square holes without round corners can be made:
 
 
In addition to this method, there are also square holes that can be directly processed with a drill, but this requires a drill.

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