These Lobster Claw clasps are 14mm long and have a swivel at the end of the clasp.
These are the clasps that are used in many of Colin's chain classes.
If you need a soldered ring to connect to your clasp then check out this pack of 10!
The Product seems okay. A little light weight for my needs. It would have been better if I could have had a more accurate way of sizing before ordering.