The Mansfield Alto ll 8" center drop-in lavatory Model 251-8-BONE is a bone 19"x16"oval sink. This lavatory is installed by dropping it in to a pre-cut hole in your counter. The Alto ll 8" center bone drop-in lavatory Model 251-8-BONE is made of a durable vitreous china material with a concealed overflow. The Alto ll 8" center bone drop-in lavatory Model 251-8-BONE comes with a 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 80 years. They are the largest domestic producer of sanitary ware. They strive to ensure that you get the best products available.