Steel Mesh Sink Drain Strainers Bath Kitchen Sinks Strainer Basket 2.5" Baskets I have here a new steel mesh sink strainer basket for your kitchen, bathroom or work sink. Oversize flange is 4-1/2 inch diameter. The actual strainer basket is 2-1/2 inch i.d., so that is the smallest drain this basket will accommodate. Largest drain hole would be a tad under 4-1/2 inch. because that is the diameter of the flange. Flange protrudes 3/4 inch. See item specs for more detail. Thanks for stopping. Please visit my slow growing store, read about me, my policies and view other items that may interest you. Also, I would be honored to be added to your saved seller list. **I always have money saving volume discounts on most items** David - thediscountretailer