Deep cup duo strainer with special ball bearing snap post and solid brass slip nut can fit sinks with a 3-1/2 inch to 4-inch opening. With its stainless steel basket and galvanized steel locking shell gives you the perfect choice for your next kitchen. To prevent food particles and debris from entering the water line this Brass heavy duty basket strainer features a lift-and-turn basket designed to protect and to allow water to descend freely. The brass construction allows it to be a long-lasting product resistant from corrosion and tarnishing.