KNC Granite is one of the leading supplier of granite, marble and quartz surface products in Maryland and Washington DC Metro Area. KNC Granite provide high quality kitchen countertops, bar tops, fireplace surrounds. tub decks, bathroom vanities. We can offer you a wide variety and range of the best stone countertops including Granite Countertops, Marble, Silestone, Cambria, Caesarstone and Zodiaq.