KOHLER K-2211-96 Caxton Undercounter Bathroom Sink, Biscuit Install beneath solid surface countertops to combine the look of an integral basin with the benefits of durable vitreous china and many color options Exterior dimensions: 21-1/4-Inch x 17-1/4-Inch Interior dimensions: 19-Inch x 15-Inch Vitreous china Undercounter installation