Aluminum cross piece is flat on back side, second photo shows relative size. You can read the markings...
(https://i.postimg.cc/4yMGk21c/IMG-8075.jpg) (https://postimages.org/)
(https://i.postimg.cc/QtfsSd90/IMG-8072.jpg) (https://postimages.org/)
Looks kinda like a fan spacer for an engine. I had to buy one not too long ago, thicker than that, but they had some that looked quite similar. Sitting there with a few other automotive tools, also.
Part of a puller?
Pritch, you may be right. It's about the right size for a fan spacer and with all the auto tools in this lot, very likely. Possibly for a Toyota as there 3 Toyota specific tools in the lot.