Square Black Diffusion 1/8 Lens Filter(100 X 100mm)- 28 Multi-Layer Coatings Dream Cinematic Effect Filter

SKU: KF01.1843

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It contains the adapter to hold the #10 ND filter and a convenient carrying case. I was under the impression that it contained the whole set of filters. There are no graduated filters either. I returned mine. 
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No, it's just the filter with case. But any brand of 100mm square filter holder kit will work (Lee, Kase, Nisi, Tiffen, etc) which accept 2mm thick glass filters. I have Kase one. 
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You have to have the appropriate filter holder for that filter. 
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Yes, it'll fit any 100mm square filter holder; mine is a Kase K-9 one and this ND filter fits perfectly.