This week's collaboration with What is it? Blog brings us this strange object - can you guess what it is? For more fun guessing game (and for dimensions clue on this object), check out What is It? blog.
Update 3/16/07: The answer is:
Aerial spacer cable insulator, allows the running of a three phase line in a minimum amount of space. The hook on the bottom left is hung on a steel messenger cable and the conductors are placed in the large inner grooves, with the small outer grooves being used for tie wires.
Congratulations to Chris who got it right!