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?
3-1/2 in. Sink Drain Assembly with Plastic Basket Strainer in Chrome - Danco
How to install a floor drain strainer - Drain-Net Technologies
Sink strainer options and what to consider
Kitchen Sink Drain Strainer Stainless Steel ǀ Kitchen ǀ Today's Design House
How do I know if the strainer can fit my drain?
Drain Strainer
When replacing a sink strainer, how tightly do you snug up the lock nut below the sink to avoid over-tightening but making it tight enough? - Quora
The Plumber's Choice 3-1/2 in. - 4 in. HeavyDuty Kitchen Sink Stainless Steell Drain Assembly with Strainer Basket Stopper ESS2157 - The Home Depot
Kitchen SinkShroom the Amazing Kitchen Sink Strainer and Food Catcher that Keeps Your Drain Clog