American Imaginations 15.25-in. W x 15.25-in. D Round Undermount Sink In White Color Inside dimensions of 13.75-in. X 13.75-in. And an outside dimension of 15.25-in. X 15.25-in.. Premium white glaze for a glossy finish with a kiln dried ceramic construction. Smooth non-porous surface; prevents from discoloration and fading. Double fired and glazed for durability and stain resistance. Quality control approved in Canada and re-inspected prior to shipping your order. Sink cut-out included in the box. It is highly recommended that you wait for the sink to physically arrive before proceeding with any cutouts. All dimensions are nominal. Faucet and accessories not included. 1.75-in. Standard US drain opening.