30" Farmhouse Kitchen Sink with Fireclay Construction and Glazed Finish: Pietra Sarda. Non-porous surface inhibits bacterial growth. Porcelain enamel glazed surface resists staining. Inherently handles high-temperature. Reversible - finished on all sides. Nominal Dimensions* - actual dimensions may vary by .5. Professional installation recommended - heavy requires 2 people to lift. The drain hole is a 3.5 standard opening - may require extended flange/ferrule due to sink thickness. Drain and grid not included. Custom/apron base required - measurements taken from actual sink. Color: White. Material: Fireclay. Installation: Apron. Shape: Rectangular. Bowl Type: Single. Exterior Width: 29 3/4". Exterior Length: 19 3/4". Interior Width: 28". Interior Length: 18". Bowl Depth: 9". Overall Height: 10". Drain Hole Opening: 3-1/2" (may require extended flange/ferrule due to sink thickness).