Especially this filter holder is particularly suitable for Cokin P polarizing filters and I am exactly why very happy to have bought it by chance. Actually, he was only intended as an option for wide-angle, but without him I would go Original Cokin polarizing filter confessed after buying a without having a suitable holder in the area! In the normal Cokin P holder (original) fits the Cokin Polarizer namely not into it!
And no - before now, the smart aleck answer - not even in the slot provided in the back. The diameter of the turntable is just too big!