2.75 inch Junior Duo Bar Sink Drain In Brushed Nickel
2.75" Junior Duo Basket Strainer Drain in Brushed Nickel, NS-403BN designed to fit standard bar sinks. Features a mini strainer to help trap small debris.  This will fit in a 2.5" opening.  The top widest part of the drain is 2.75" diameter and the base diameter is only 2.25".  Overall height is 3.25" when assembled.