Kitchen Sink Flange for Thick Sinks Fits Sinks up to 1-3/4 Inch Thick Fits standard sink garbage disposal opening of 3 ½ inches with a top flange width of 4 ½ inches Works with most garbage disposals that use a 3-bolt mounting system Do not use harsh alkali or acid-based detergents, abrasive polishes, or scouring cleansers on flange