If you have a charm or flower or doo dad you've been wanting to turn into a pendant these little babies will be of help. Use a little E6000 glue or Goop, use clamps to keep together overnight and you're good to go. I have used padded clamps made especially for this type of thing, but you can always use those big black office clamps in a pinch (pun intended). They measure 16x6mm (25mm = 1 inch)
They are made of 100% solid brass. Made in the U.S.