Wittner Center Chin Rest 4/4

I bought it for my girlfriend's violin. She always struggled with the chin rest she had so we wanted to try the central version. And she seems really happy. It's easy to mount and she says it's much much better now.
Only one thing: check the thickness of the violin you have. For example it didn't fit on her electric violin (the violin is too thin even when the rest is completely tighten up.