KOHLER Sink Rack for K-5290-NA Undertone and K-5290-HCF Undertone Preserve Sinks, Stainless Steel Fits in the bowl of K-5290-NA Undertone and K-5290-HCF-NA Undertone Preserve kitchen sinks. Comes included with the K-5290-HCF-NA Undertone Preserve kitchen sink. Durable stainless-steel construction. Dishwasher safe. Innovative wheels around the perimeter provide a secure fit and reduce debris buildup.