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. It has embossed stars all the way around it (six total), details can be observed in the pictures.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 copper-smiths use. This copper sink was made from one sheet of copper, as a matter of fact, the stars are pulled out of the copper sheet itself. The finish is in a aged 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)."