First off, I forgot to take a picture, so I apologize for that. I saw some of these at a recycler while on holidays. These nuts were aprox. 1" across, 6 sided(some are domed and some are flat). They have a brass nut(3/4") cast into the lead. I'm told it had an electrical application. I did remember to test for Zn(neg). Anyone seen these? I forgot to do a rudimentary hardness test. I figured if someone is putting a wrench to these, maybe there is some desirable alloys in it. Any thoughts.