Nantucket Sinks 21-inch self-rimming vanity sink is an artistic fixture for your bath . Sculptural and contemporary, the low profile design creates a feature much like an infinity pool on your vanity. Installed as a drop-in or top mount, it creates an edge-less elegant look. Constructed of durable vitreous china, it is practical and easy to wipe clean. Sealed with a high gloss enamel glaze. The sloped basin allows for good water drainage. No overflow. Nominal dimensions, actual may vary by up to .25 inches. This sink is ADA compliant when installed according to ADA guidelines.