Here is the inside look at the CD 399 EIV 325AT seacoast pin type insulator. This insulator is really neat, three pieces of glass cemented together to create one really cool glass "fogbowl". It also has a threaded thimble cemented in the middle so it can be threaded on to a insulator pin. Dry flashover rating at 120 Kilovolts! Leakage distance of 30-1/4 inches!