Not very sturdy. They are very expensive but not very high-quality.

These are great quality keychain lobster clasps. Can even be used on jewelry for larger necklace pieces. Small and perfect for my use of clothing closures.

The clasps are more like aluminum foil. Very flimsy and will break or dislodge. I fear if i used pliers to force them open they would crumble into nothing.

Smaller than described. The swivel ring measures 13mm from the widest part. These are tiny—they measure at most a notch past 1”.