KOHLER Riverby Undermount Cast-Iron 33 in. 5-Hole Single Bowl Kitchen Sink Kit with Accessories in DuneKOHLER Riverby Undermount Cast Iron Kitchen Sink Redefine your kitchen space with the elegant KOHLER Riverby sink. This sturdy enameled cast iron sink features a single spacious bowl that resists scratches, burns, and stains. Its thoughtfully designed accessories make it versatile for any culinary task, ensuring seamless integration into any kitchen aesthetic. Key Features: Durability: Made from enameled cast iron that resists chips and scratches.