How do I know if the strainer can fit my drain?

Sometimes, the product descriptions on the package or website are so confusing. It is saying that most sinks have a 3.5 inch – 4 inch diameter drain opening. But why the description of some strainers is 4.5 inch?

What is a basket strainer drain? Do I need an extension or

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How do I know if the strainer can fit my drain?

Product Detail Page

Qtimal Kitchen Sink Drain Strainer with Upgraded Handle, 2 Pack

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