Thunder Group Stainless Steel Sink and Tub Strainer, For 2.25 Inch Diameter Hole, Pack of 4 The outer diameter is 4.25, but the basket diameter that fits inside the drain is 2.25 Fits standard sink holes that are approximately 2.25 in diameter and 1 inch deep Finely spaced mesh grating helps ensure clog-free drains Allows water to pass through while capturing bits of food and waste For catching hair in drains such as bathtubs. Set of 4- Bathroom and Kitchen sink strainers made of durable stainless steel. Outer diameter is 4.25", but the basket diameter that fits inside the drain is 2.25"