Here are a couple of new additions I got awhile back. From L-R Preformed Line Products Clamp top insulator, Smaller Preformed Line Products 15KV insulator. Last is a Hendrix clamp top insulator. Preformed Line Products have been in buissness since the 40's. There line of poly plastic insulators are similar to Hendrix's designs. Something I didn't know about the clamp tops, when a friend gave me the Hendrix I thought it was damaged due to the loops broken off of the clamp screws. It turns out that when the linemen set and clamp the wire they are cut off by the linemen so you would have to use a wrench to adjust them in the future. The Hendrix one is used. The Preformed Line Products was new old stock when I bought it. Preforms marking is pictured on the side.