Elegant Hardware 18.5 by 16 by 5.75 inch deep oval undermount copper sink adds elegance to any room. It features 17 gauge copper and we guarantee the weight (sink only – not shipping weight) to be at least 4 LB 1 OZ. The hole for the drain has a 1 5/8 inch opening and is flat edged, not punched into a cone, which ensures a solid seal for both common 1.25 and 1.50 inch drains. The Oil Rubbed Bronze Fired finish affects the copper itself – much more durable than a finish created with acid or paint; each sinkâs finish is similar but unique. The tightly hand-hammered texturing adds additional strength to the copper .