I picked up these three at the dump site. Can someone tell me what their called and how they were used . As always any help appreciated. Thanks to James and Raine for following info " These are line post insulators". Bill Kuhar provided following info;" These are clamp top posts mounted on a ridge iron. They are mounted on top of the pole and function the same as a pintype insulator on a ridge pin. Probably 15 KV or less". Thanks to all for your help