Not Interchangeable with Arca.

The plate fits in Arca (Eg Mengs, Sirui) clamps, but standard Arca plates do not fit in the Cullmann clamp Which is slightly narrower and has a fixed safety pin stocking up too far to the side. Had Cullmann Complied with the Arca width and used a spring driven safety pin (like Sirui o Their lightweight ball heads), or moved the in a bit Further in, this would have gotten a good score for lightweight and compactness, but now only a 1 . As consumer I am fed up with companies not sticking to standards, locking me in to Their designs.