Based on the positive reviews, I was expecting a better product.  The extension is a full two inches.  Also on the plus side, instead of the circle clasp pictured, this has a lobster claw clasp which is definitely easier to handle.  However, the link that is hooked to it is not sautered, meaning that it can pull apart, which is for me a serious negative.  The other thing I did not like is that sterling silver items almost always carry a marking to that effect, such as 925.  This item is not marked at all, meaning we just have to take the seller's word for it being sterling silver.  I will revisit this review if my neck turns green or the item wears like pot metal and up or downgrade accordingly.