McKesson Calculi Strainer: Mesh Screen: The mesh screen has 60 squares per square inch, which is the optimal size for filtering the smallest stones while allowing unobstructed flow-through. Built-in Tab: Designed for easier handling and sanitary conditions. Durable White Plastic Construction: Ensures durability. Rinsable Plastic: Allows one patient to use the strainer for several days. Fits 24-Hour Specimen Collection Containers: Conveniently fits into containers. Single Patient Use: Disposable and not made with natural rubber latex.