SILGRANIT is made of quartz sand, the hardest element of natural granite making it long lasting and durable Easy-to-clean low maintenance material has a non-porous, smooth stone surface Effortlessly remove scuff marks from utensils and stains from food and drinks Versatile dual mount design for drop-in or undermount installation Pre-drilled for single hole faucet with the possibility of 4 additional knock-out holes for accessories 80-percent rock hard granite Bowl depth 9-1/2-Inch and 8-Inch Outside dimensions 33 inches by 22 inches Truffle Drain width 3-1/2 inches