I think these strains are quite weird. The big one in the middle is 6" X 5" and weighs 12 pounds! Many collectors nicknamed it a dinosaure tooth. The one on the left is 3 1/4" X 2 3/4. Definatly an Ohio Brass product judging by the glaze. The one on the right is more rounded measuring 3 X 3. None of these are marked but just about every porcelain insulator manufacturer carried them. I thought about taking them to my dentist as a joke and saying "Hey doc, had some teeth fall out and I'm an insulator collector. Can you fix them"? I could just imagine his face as I told him this. Are you nuts!!! I would love to find a picture of these in use. Someone had told me years ago that these were used on Naval ships. Must be top secret because I couldn't find a picture yet. Very neat though.