Sometimes it's good to be a one-trick pony, you know? You do one thing, and you are AMAZING at it. There's no shame in that. This handy clamp is like that. It is used to position two pieces of rigging (such as speedrail) perpendicular to each other. That's all it does. But it is incredibly good at it. When you need a 90 degree angle between two pieces of pipe, this is what you should rent. It is compatible with round structures from roughly 1 ¼" to 3" in diameter.