Transform your bathroom with a beautiful granite vanity top with attached under-mount porcelain sink. Perfect for quick and easy remodels Obtain the beauty and durability of natural granite without hiring a professional. This granite top is easy to install and fits directly on top of any standard 30 in. vanity cabinet. The granite top is 31 in. L x 22 in. D x 3/4 in. thick. Granite is a natural material and slight variations in color may occur and are natural.