View 2 of *drain piece NOT included* 
KOHLER K-2883-0 Verticyl Round Undercounter Bathroom Sink, White, Exterior dimensions: 15-3/4-Inch diameter

Double tap image to zoom

View 1 of *drain piece NOT included* 
KOHLER K-2883-0 Verticyl Round Undercounter Bathroom Sink, White, Exterior dimensions: 15-3/4-Inch diameter
View 2 of *drain piece NOT included* 
KOHLER K-2883-0 Verticyl Round Undercounter Bathroom Sink, White, Exterior dimensions: 15-3/4-Inch diameter