Holophane Dome Light Shade. This insulator was originally made in western Russia by the LVIV INSULATOR PLANT started in 1965 and later became the LVIV INSULATOR COMPANY in 2002. In their catalogue it is called an SS 10D HIGH VOLTAGE insulator.
This is a as new example ready to use for whatever purpose you require. It does not have a pre drilled hole for use as lighting component. Choose this option if required.