The 1590G comes with 4 screws. It's diecast aluminum. It's shrinkwrapped.
It's kind of a mini version of the 1590B. (Check out the product images for a side-by-side size comparison of the two.)
The aluminum machining looks way nicer and more finished than what I used to get from the big suppliers before I started sourcing my own.
It measures 100 x 50 x 25.7mm / 3.94 x 1.97 x 1"