Shop for Bath at The Home Depot. Transform your bathroom with a beautiful granite vanity top with attached undermount 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 inch vanity cabinet. The granite top is 31 inches in length, 22 inches deep, and 0.75 inch thick. Granite is a natural material and slight variations in color may occur and are natural.