This is a Sediver multi-glass column station post insulator. It is 30" tall, 8" in diameter and weighs 70 lbs, and has never been in use. This insulator has 10 glass skirts, the top and bottom caps have a 3" bolt hole circle pattern, 4 holes - 1/2" N.C. threads, TR-216. It is clear to ice aqua in color. Rated for 69,000 volts, 350 BIL rating. This is neat piece of glass to have.