I have such a (cheap) to buy hardly dared part.
Somehow I wanted to know times.
I can anticipate say that the build quality is beyond doubt.
Excellent fit and very clean finish.
Clever is the solution of the attachment to an eg spherical head.
Either one uses the embedded thread or used from above introduced a 1/4 inch flat head screw.
Depending on the tripod head. Very versatile.
I screwed the clutch on a very stable Manfrotto Hydo Kugelkof.
No game, no wobbling, turning away.
The camera will not budge.
From me a strong buy recommendation with Sterr Nchen. *****