Coflex Extra Deep Cup Sink Basket Strainer with Sealing Lid, 304 Stainless Steel, Brushed Nickel Finish Premium Grade 304 Stainless Steel Body, Basket and Lid. Contemporary Design in Brushed Nickel Finish. Convenient extra deep removable basket prevents debris going down the drain. Lid seals tightly to soak dishes. Fits 3 1/2 "drains on Stainless Steel sinks, new thread design allows installation in Composite granite, Cast iron and Concrete sinks. No Tools Needed to Install. Gaskets Included Replaces Use of Plumbers Putty. 5 year Warranty.