According to my database, the chance of freezing is the same as the Freeze Target mod on Buriza. Freeze Target +3.

It has an approximately 1/3 chance to freeze your opponent for 3 seconds. Again, same as Buriza.

I will not recommand this socket, as PvM is already very easy with a WF. But if you like the freeze effect and have the rune, feel free to do so.