They are not machined so that all 3 corners are 90 degrees apart. If you attach pipes to the three threaded holes, they will not line up with properly machined parts, that is, at a 90 degree angle. For example, when assembling a table, one of the sides will be beveled because one of the threaded tees is 5-10 degrees off 90 degrees (all 3 directions are misaligned).
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