Mansfield Covington UnderMount Model 218NS-BONE is a Bone 22?x14?rectangular sink with. Is mounted to a counter top for easy quick installation The Mansfield Covington UnderMount Lavatory Model 218NS--BONE is made of a durable vitreous china material with a concealed overflow. The Mansfield Covington UnderMount Lavatory Model 218NS-BONE comes with the limited lifetime Mansfield warranty. Mansfield is an American company that?s been in business since 1929, and has been one of the top producers in design, and quality for the past 40 years. They are the largest domestic producer of sanitary ware, and strive to ensure you get the best products available.