Keeney Plumber's Spec 3.5-in Stainless Steel Rust Resistant Strainer with Lock Mount Included in the Kitchen Sink Strainers & Strainer Baskets department at Lowes.com
What are Inline Basket Strainers?
MOEN Stainless Steel 3-1/2" Basket Strainer with Drain Assembly 22036 - The Home Depot
Huge Selection of Basket Strainers for Kitchen and Bar Sinks