Basket strainer is an ideal addition to your kitchen sink.-A high quality strainer prevents food particles and debris from obstructing the drain pipe. Basket Strainer installs in sinks with standard 3.5-inch or 4-inch opening.-An open/close stopper that seals tightly makes this strainer convenient and reliable. Outer size 4.5 inches.-Inner size 3.15 inches.-Height 4 inches.-Diameter pile 1.75 inches. Construction: -Basket strainer is constructed from stainless steel. Warranty: -Limited Lifetime Manufacturer Warranty.