Nantucket Sinks 3.5EDF-MBL extended flange is perfect for use with fireclay sinks or garbage disposals. For ISE type units with 3-3/8" I.D. Spring loaded center post for smooth strainer operation. Matte black finish coordinates with many of Nantucket Sink''s matte black Vineyard Collection matte black sinks or your chosen kitchen hardware! (installation required - garbage disposer is not included with drain).Dimensions: 4.5" Diameter x 2.5" High (collar)Extended collar is designed to fit fireclay applications and garbage disposalsFor disposer with 3-3/8"3 I.D. and 3 bolt mounting.Fits sinks up to 1-3/4"3 thickFits Insinkerator (ISE) "" old and new models, Kenmore, Maytag, Ace, Jenn-Air, Kitchen Aid, Whirlpool disposalsBeautiful brushed stainless finish coordinates with your kitchen fixturesProfessional installation recommended• This drain is meant for disposal application only - please do not purchase if you do not have a garbage disposal as it will not fit.