K&F Concept 82mm Variable ND Filter ND8-ND128 (3-7 Stop) HD Hydrophobic VND Filter for Camera Lens No X Cross

SKU: KF01.1080

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yes, on both sides of the filter 
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For the Nikon 7200 you need a filter in the size 67 mm, this also applies to all lenses. 
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It's better to buy a cleaning fluid for lens filter. 
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Yes, it has threads on both sides but they do not have the same diameter. For example, if the filter is 77mm, the outer part is 82mm. 
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ND2-ND32 filter allows you to reduce 5 steps, ND8-ND2000 is 9 steps, ND8-ND128 is 5 steps. 
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Hello, they stops is different, the nd8-128 is 3-7 stop the ns 32 is 2-5 stop 
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The filter is made out of the Professional Optical Glasses, and multiple layer nanometer coating 
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This really depends on multiple variables, but I would suggest the 8-128. The 2-32 will do well, but if you're shooting at 24fps, with a 1/48 (or 1/50) shutter, then it gets bright, so the extra couple of stops to 128 can be helpful. ND8-128 will give you the ability to just crank your ISO up a bit if the ND8 is a little too much as the sun gets dimmer.