Yes it is. It's actually 2 pieces.
The bottom part goes down to the floor and is bolted to the stand with lag screws at the bottom and top of the stand.
Then the top piece rests on the stand and is bolted to the other piece. I made it like this so I can remove the top piece without having to get down behind the stand again. It also allows me to be able to raise or lower the height of the fixture by using different bolt holes in the top piece.
What's nice is the whole light stand/hanger cost less than $35 including paint and sand paper and I used tools I already had.