This bathroom copper sink has a standard 1.5"" diameter hole and it does not have an overflow system. It is designed for over-the-counter mounting because its rim is rounded. This hammered bathroom copper sink is a beautiful piece of art. 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. The border is rounded.This copper sink was made from one sheet of copper, raised with the artist hammer, there are no welded joints.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.