Further information:
I purchased this in December 2019 the mainly for the filter holder due to an easier CPL rotation mechanism, but decided to go back to my NISI system as I am more comfortable with it.
I have only used the Filter holder and CPL in one outing,
The Square filters have never been used.
This is a great system for anyone wanting to get more out of their photography.
the kit includes:
1x Sirui 100mm Filter Holder
3x Adapter rings - 67- 82mm, 72 -82mm, 77-82mm
1x Sirui 86mm Nano CPL
1x Sirui Square ND 1000
1x Sirui Soft Grad 1.2 Filter
Here is the sirui website with more information.
https://www.sirui.com/index/filter/kit.html?cid=12&id=65
I have also listed on another for a faster sale, but offering first dibs + discount on stereonet
Photos: