This is a 10" Tiny rack mount for the D-Link DGS1008p and the D-link DGS1005P. In the cover image, I only have the DGS1008P mounted, but I also tested the DGS1005p and it also fits the same on the rack. 

Fits the standard 10" tiny rack mount.

dimensions of cutout in the middle for the DGS1005P Model: 2.85cm (height) X 10.5cm (width) x 10 cm (depth) || 1.12" X 4.125" X 3.925"

DGS1008P:  2.9cm X 15cm X 10cm || 1.14 X 5.9 X 3.925

The gaps beside the switch are just for passing cables backwards as seen in that one picture. 

I do not know if this also fits other models like the managed one, so do the measurements and verify the cutout is the same. There's a small lip at the back to keep it from sliding backwards, and the fit is pretty good, but YMMV. 

Takes just shy of 90G of filament per model. Could lower the infill to get that lower as well, I doubt the strength would be compromised. These things are very light