Black Galaxy Granite is a fine to medium grained black gabbro plagioclase of the Precambrian period with golden-yellow shimmering bronze scales. Black Galaxy vessel sink is made from a natural stone rock, carved by hand into a smooth, easy to clean sink. This natural granite sink is very unique and different from each other, which gives a modern and elegant felling to your bathroom. The drain hole is 4.5cm in diameter, which is the common drainage size of our all sinks, or you could make customized.