Universal CROSSBARS

I bought these to make earrings but the metal, although nice and sturdy, had a rusty-looking little spot but it was sooth. I wasn't really making earrings but bought a light fixture that I didn't realize needed somehow to hang it up. So after discussion with my handyman, I found these, bought them and he said they were great after we found screws. I'm not sure they came with screws because I'm doing a lot of updates and I've lost stuff, etc. I did buy some other gadget that are circular and does have screws and the plastic twist caps.