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).IMPORTANT NOTE: The patina can be damaged faster if toothpaste (only the whitening one) stays for long periods of time on the sink surface, because of this, washing it after brushing teeth is recommended."Hand-hammered and mold-cut to perfectionHandcrafted by Mexico''s Finest ArtisansWe include 1" long brown screws in all of our hammered copper switch plates