When I was using my AP700's on my 200DD tank I could not get enough light with just one AP700 for my needs. I did not want to mount one on each side of the tank. I wanted to mount BOTH AP700's on the same set of Kessil arms. So I had someone weld some extensions onto the normal arms so I could mount TWO AP700's one towards the front of my tank and the other towards the back. See the VIDEO for how that looked. I am attaching a few close ups of the arms so you can see its all painted and welded securely. I sold my AP700's a couple years ago but did not sell these with them. They are taking up space and I figure someone MIGHT be trying to do the same thing and could use these. Prove to me you have a tank to use them on and have AP700's and I will sell these for $20 for the set plus actual shipping cost. Pictures are from my tank when the AP700's were on it.