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?

Kitchen Sink Drain Strainers Everything You Need To Know!

Frequent asked question for plumbing product

Seatery 1.75 Bathtub Drain Strainers, Shower Drain Hair Catchers, Stainless Steel Drain Filter Cover for Bathroom Laundry Floor Drain, Fit for 1.65-3.0 Drain Hole Black

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

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Mestream 2PCS Bathroom Sink Drain Strainers, 1 Small Conical Premium Stainless Steel Porous Hair Catcher, Drainer Filter, Fit for 1.20-1.60, Depth Than 1.60 Drain Hole

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How to Unclog a Shower Drain and Keep It Clean, Architectural Digest