Kraus KGD-412B 31 1/5 inch Dual Mount Single Bowl Black Onyx Granite Kitchen Sink PREMIUM GRANITE COMPOSITE: Ultra-durable material made from 80% natural quartz for the look and feel of real stone RICH NON-FADING COLOR: UV-stable material offers a rich and consistent hue that will not discolor over time INSTALL AS UNDERMOUNT OR DROP-IN SINK: Versatile dualmount design is compatible with a range of countertop configurations and materials SUPERIOR CLEANABILITY: Naturally hygienic non-porous material is highly resistant to dirt and grime, easily wipes clean SINK DIMENSIONS: 30 3/4 in. L x 20 1/8 in. W x 8 6/8 in. D / MINIMUM CABINET SIZE required for installation: 33 inches