This kitchen copper sink has a standard 3.75 diameter hole in a single compartment. This hammered kitchen copper sink is weathered finished.The copper sheet is 14 gauge (0.064" thickness). The border around the four sides of the sink is 2", which makes the bowl itself 18"x16"x8".The techniques used by Santa Clara del Cobre craftsmen is the same one used for several centuries, where no sophisticated tools are used, just the furnace to heat the copper and a hammer to give it the shape. Along your home decoration, this piece it will add a unique touch to your kitchen making it a very special point of attraction. The patina can be damaged faster if any abrasive substances stay for long periods of time on the sink surface, because of this, washing it after usage is recommended; besides that, no more maintenance is required."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