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?

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?

SimplyCopper 4.5'' W Basket Strainer Kitchen Sink Drain

LotFancy 30 Pcs Bathroom Sink Strainer, 2.75 in Mesh Drain Strainer, Silver

Best Kitchen Sink Strainer - OXO Silicone Sink Strainer Review

Keep It Handy Sink Strainers 2 Pack - Tesco Groceries

PlumbShop Stainless Steel Kitchen Basket Strainer with Assembly Kit, fits 3.5-in Drains

Mestream 2PCS Bathroom Sink Drain Strainers, for Diameter 1.3-1.6 (Depth Than 2) Drain Hole, Small Cylinder Porous Hair Catcher, Premium Stainless Steel Drainer Filter, (1.1)

Bathtub Drain Strainers/filter Baskets Stainless Steel Hair - Temu

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

Best Bathroom Sink Basket Strainers to Prevent Clogs