It is a Naskan type die-cast carabiner.
Mini size with a total length of 35 mm that is easy to use for key chains and small items.

Comes with a stopper that prevents things hung under the ring from moving upward.
When the hook is opened, the stopper is also released in conjunction with it, allowing objects to pass from the top to the lower ring side.

Since it has a nickel-free plating finish, it is also recommended for those who are concerned about metal allergies (*).