I found this small aluminum item in a tool box. It’s 1.5" diameter. The two pieces screw together. I thought it was a little stash container, but the larger piece has a nub inside which would fill the void on the smaller piece when screwed together. Is this some tool? Or maybe a little machinist project.
maybe perhaps it’s a pair of caps for sensitive equipment, like some coaxial cable termination. these things can get expensive