How to use a PBR Material's Mask Image

I downloaded a texture from https://cc0textures.com/view?tex=Marble03 which includes a mask.jpg file.

How do I integrate that new file into a node map? Here is my current node map.

I would use cubic interpolation for the bump map, other than that it looks fine to me. I can’t imagine what a mask is all about for a marble. Perhaps SSS factor, specular reduction maybe?

Why would you use a cubic interpolation instead of the bump map?

It provides better smoothing. Without it, stepping can become more obvious. Zoom in and give it a try. I usually adjust my bump on a pure sharp glossy node, sometimes after using it as microdisplacement (only, no bump) to find a reasonable bump distance.

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