Nantucket Sinks UM-18x12-B 18-Inch by 12-Inch Rectangle Ceramic Undermount Vanity, Bisque Exterior Dimensions: 21" x 14.25" Interior Dimensions: 18" x 12" Bowl Depth: 6" 1.5" Drain Opening with Overflow Crafted from Vitreous China Designed to Undermount to Solid Surface Counter