The bathroom copper sink you are looking at has a standard 1.5 diameter hole and it does not have an overflow system. This hammered bathroom copper sink is a beautiful piece of art. It is designed for over-the-counter mounting because its rim is rounded. From a copper sheet the wise artisan hands transform it into this unique piece. The hammer footprint is very visible. The reddish/oxidized texture is characteristic of natural copper when it is cooled down from red-hot temperature using cold water, technique that the coppersmiths use. The border is rounded and sits on top counter.This copper sink was made from one sheet of copper, raised with the artist hammer, there are no one welded joints, the lizards are pulled out of the copper sheet itself.Hammering the red-hot copper is an ancient technique the copper smiths use, where no sophisticated tools are used, just the furnace to heat the copper and a hammer to give it the shape. We got this bathroom copper sink from the skilled copper smiths from Santa Clara del Cobre, Mexico. The finish is in a dark brownish color. Suitable for your bathroom, it will add a unique home accent making it a very special point of attraction in your bathroom. The copper sheet is 16 gauge (0.05" thickness).IMPORTANT NOTE: The patina can be damaged faster if toothpaste stays for long periods of time on the sink surface, because of this, washing it after brushing teeth is recommended."