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The Karran QU-721-BL is a 60/40 split double-bowl quartz kitchen sink that undermounts into granite, quartz, or solid surface countertops, pairing a full-size prep bowl with a second, smaller basin in a matte black finish.
A 60/40 split does something an equal double bowl does not: it gives one side a clear size advantage. The larger bowl handles the main work — soaking a stockpot, washing sheet pans, managing the evening cleanup — while the smaller bowl stays open for rinsing produce, draining pasta, or setting a drying rack without crowding the primary basin. Both bowls run 9 inches deep, so neither side feels shallow. This is the configuration that suits a kitchen where the sink sees heavy, varied use every day rather than light dish-rinsing duty.
The sink body is quartz composite, combining quartz and acrylic resin into a material that is denser and more uniform than enameled cast iron or pressed steel. The matte Black finish runs through the material rather than sitting as a coating on the surface, so chips and scratches that reach into the body do not expose a different color underneath. The finish reads as a true, consistent black under both warm and cool kitchen lighting, which makes it a reliable match for black fixtures, dark cabinetry, and high-contrast countertop pairings.
This sink is the right call for a full-production kitchen where workflow matters: home cooks who prep and clean simultaneously, remodelers building a kitchen around a modern dark-finish palette, or designers specifying a statement sink that does real work. The undermount profile requires a countertop that supports undermounting, so it belongs in a new countertop fabrication rather than a retrofit into an existing cutout. The 33-1/2 by 20-5/8 inch footprint needs a 36-inch base cabinet minimum. Designers pairing black sinks with matte black faucets and hardware will find this finish holds its tone consistently rather than pulling blue or gray.
No. This is an undermount sink and needs to be planned into a new countertop fabrication. It is not designed to retrofit into an existing cutout left by a previous sink.
It is designed to undermount into granite, quartz, and solid surface countertops. Confirm material compatibility with your fabricator before finalizing the cutout.
The left bowl is the larger basin at 18 inches inside length and 18 inches inside width. The right bowl measures 11-1/8 inches inside length and 16-1/2 inches inside width. Both share a 9-inch inside depth.
No. This sink is not ADA compliant.
It is cUPC certified and IAPMO certified, meeting standard residential plumbing code requirements.
The Karran QU-721-BL brings a 60/40 workflow layout and a dense quartz composite body together in a matte Black finish that coordinates cleanly with dark-palette kitchens and stands up to daily use without looking worn.
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