"This item is more or less as described. The main difference is that the opening is less than 1mm wide.
I don't think it would be much use as a pearl necklace shortener: the opening is far too small to allow you to loop pearls through and you would worry about tearing the beading thread. Luckily for me, that's not why I bought it!
I recently purchased 3 stacking bangles which are a bit too big and constantly slide off my wrist. Now that they are attached together, they snag before falling off. Good result, thanks Moondrops!
That said, I had to bend the clasp quite aggressively to open it enough to slide the (fairly thin) bangles through without scratching them. I havent bothered screwing the clasp properly closed because the opening is so small, there is no way the bangles will fall out."
Oval screw clasp - Connector - 925 Sterling silver - 14mm