Yes X
It is 7075-T aluminum.
Not as light as pure aluminum or other hardened grades of the alloy of course, but a work horse in wear and tear situations. Still lighter than cast steel which in this case is what these door strikers are made from.

The dremel tool at 35,000 rpm's is doing a fair job of cutting through with a few rest stops in between. Already half the weight. When I get back to New York, I'll weigh it on the ounce scale and get a true number.