Porcelain Sinks All porcelain sinks (undermount and vessel) are available in both a white or a bone color, even though they are not all shown. Undermount Sinks: Biscuit Oval Undermount SinkExterior measurements: 19 3/8" x 16" x 6 1/2" DeepMini Rectangular Undermount Sink (Interior Dimensions: 16 1/8" x 11")Rectangular Undermount Sink (Interior Dimensions: 18" x 13")Rectangular Undermount Sink (Interior Dimensions: 18" x 13")Rectangular Undermount Sink (Interior Dimensions: 18" x 13") Vessel Sinks: Mixer16" Round, 6 1/2" Deep