Concrete Finish and Compact Undermount Fit
The Karran QU-820 is a quartz composite undermount kitchen sink in a Concrete finish, sized for kitchens where a full 30- or 33-inch bowl is simply too wide. At 24-3/8 by 19-1/8 inches overall with a 9-inch bowl depth, it installs beneath the countertop and leaves no visible rim above the surface. This kit includes stainless steel basket strainers, a bottom grid, and Luster Pro oil, so the essentials ship with the sink.
Key Features
• Quartz composite construction (80% quartz, 20% acrylic resin) delivers a surface that resists scratches, stains, chips, and heat through daily kitchen use.
• Concrete finish adds an understated, muted tone that coordinates with both warm and cool cabinet palettes.
• Undermount installation positions the bowl beneath the countertop for a clean, rim-free counter surface that wipes down without a ridge to catch debris.
• 9-inch bowl depth handles tall stock pots and larger cookware while keeping the sink footprint compact in narrower cabinet runs.
• Kit includes basket strainers, bottom grid, and Luster Pro oil so key installation and care accessories arrive with the sink.
• No faucet deck means the faucet mounts through the countertop, keeping the top rim clean and uninterrupted.
Where This Sink Works Best
A 24-3/8-inch overall width makes this sink a practical answer for secondary prep stations, smaller kitchen footprints, and galley layouts where a standard 30- or 33-inch sink would crowd the countertop. Island builds with a compact sink base, butler's pantries, and bar areas with quartz, granite, or solid surface countertops are natural homes for this model. Because it undermounts beneath the counter, the surface material needs to be capable of supporting a concealed-rim install — solid surface, quartz, and natural stone are the appropriate choices here.
Material and Finish
Karran's quartz composite is 80% natural quartz crystals and 20% acrylic resin. The resulting material is highly scratch, stain, chip, and heat resistant, holding up to the kind of repetitive contact a working prep station delivers. The Concrete color is a mid-tone grey-brown that reads as neutral in most kitchen settings without competing with stone countertops or cabinet hardware. Unlike gloss white finishes, Concrete's matte texture is forgiving of minor surface marks and water spots between cleanings. The included Luster Pro oil is Karran's own care product formulated to maintain the quartz surface.
Who This Is For
Cabinet shops specifying a secondary sink in a kitchen remodel will find the compact footprint useful when the sink base is narrower than a standard 36-inch run. Designers working with integrated stone or quartz surfaces benefit from the undermount profile, which keeps the counter detail unbroken. Homeowners planning a galley kitchen or adding a prep station to an island have a straightforward kit option here, with the grid and strainers already resolved. Because the faucet mounts through the countertop rather than through a deck on the sink, faucet selection and hole drilling are part of the countertop fabrication conversation, not an afterthought.
Does the faucet mount through the sink or the countertop?
Through the countertop. The QU-820 has no faucet deck, so faucet holes are drilled into the counter material during fabrication. This keeps the sink rim clean and gives the fabricator control over hole placement and count.
What countertop materials work with undermount installation?
This sink is designed for undermounting in solid surface, quartz, and natural stone countertops, where the material is strong enough to support a concealed-rim install. It is not the right fit for standard laminate, which requires a seamless-series sink for an integrated look.
What is included in the kit?
The kit ships with stainless steel basket strainers, a bottom grid, and Luster Pro oil. Templates and mounting clips are not included; those are coordinated with the countertop fabricator and the countertop material.
Is the Concrete color close to grey or closer to brown?
Concrete is a muted mid-tone with grey and warm undertones, sitting between a cool grey and a warm taupe. It reads as neutral in most kitchen settings, which is why it pairs well with both cool-toned stone and warm wood cabinet palettes.
What is the minimum cabinet size for this sink?
The minimum cabinet size is not published in the available source data. With an overall width of 24-3/8 inches, confirm the exact cutout dimensions against your cabinet opening before ordering.
A Kit Sized for Compact Kitchen Builds
The QU-820 in Concrete brings quartz composite durability and a clean undermount profile to kitchens where space is the primary constraint, arriving as a complete kit so the first-use accessories are already on hand.
