A Concrete-Finish Quartz Undermount Sink for a Modern Kitchen

The Karran QU-721-CN is a 60/40 double-bowl undermount kitchen sink in a Concrete finish, built from quartz composite and designed to mount beneath granite, quartz, or solid surface countertops.

Key Features

• Concrete finish quartz composite body with a muted, industrial-modern color that coordinates with stone and matte countertop surfaces.
• 60/40 double-bowl split gives a larger primary bowl and a smaller secondary bowl for task separation.
• Undermount installation designed for granite, quartz, and solid surface countertops.
• Both bowls are 9 inches deep, providing full working depth on each side.
• Requires a minimum 36-inch base cabinet to accommodate the 33-1/2 by 20-5/8 inch footprint.
• cUPC and IAPMO certified for plumbing code compliance.

How the 60/40 Split Works in Daily Use

A 60/40 sink divides the basin asymmetrically: the larger left bowl handles the workload that needs room, soaking a stockpot, washing large cutting boards, or batching dishes, while the right bowl keeps a secondary station open for rinsing produce, staging clean dishes, or running a separate prep task. Both bowls sit at the same 9-inch depth, so neither side feels compromised. The Concrete finish reads as a neutral across stainless appliances, white cabinetry, and darker wood tones, making it easier to fit into a kitchen palette without the sink standing out as a focal point.

Quartz Composite Construction in a Concrete Finish

The sink body is quartz composite, a dense material that resists the kind of surface marks and staining that come with everyday cooking and cleanup. The Concrete finish is a matte, warm-gray tone that softens the look of the sink against stone countertops and keeps minor water spots from standing out. Because the color runs through the material rather than sitting on the surface, chips and scratches blend in rather than revealing a contrasting layer beneath. The 3-1/2 inch drain opening on each bowl is a standard size that accepts common basket strainers and disposal flanges.

Where This Sink Fits

This sink is a good fit for a kitchen remodel or new build where the countertop is being fabricated in granite, quartz, or solid surface and the designer or installer wants a concrete-toned basin that recedes into the surface rather than contrasting against it. It suits homes with an industrial, transitional, or Scandinavian aesthetic, and it works equally well in a professional kitchen layout where task separation between the two bowls matters as much as the finish. The 36-inch minimum cabinet requirement means it is sized for a standard large-base cabinet run, not a compact kitchen. The cUPC and IAPMO certifications satisfy code requirements for residential and light commercial plumbing inspections in most jurisdictions.

Common Questions

A Concrete-Tone Sink Built for Real Kitchen Work

The Karran QU-721-CN brings the utility of a 60/40 double-bowl layout and the understated look of a Concrete finish together in a certified, quartz composite undermount sink sized for a 36-inch cabinet run.