I chose this because of the variety in lengths and colors/styles, as it will allow me to adapt many of my necklaces for different blouses. I am very happy with this purchase! I have 2", 2 3/4", 3" 3 1/2" and 5" lengths. I think a 4" would have been better than the 2", but all will be usable. The yellow gold vermeil is 2 3/4". I appreciate the link size, because that makes it easy to fit the clasp of the necklace into the link, many other brands are too small to be truly fully adjustable, as these are - and the clasp then goes easily into the necklace O-end. I took another reviewer's suggestion and lablelled each separate plastic bag with the extension lengths for convenience, and am storing all together in the larger cloth bag. I also much appreciate the protective anti-tarnish paper in each separate extender bag. The box the set came in is attractive and sturdy; I have re-purposed as my travelling box, to keep my jewelry safe from being crushed when packed into my carry-on bag, as I pack that pretty hard!