I want to make some half cylinder wall sconces for outdoor lighting. Maybe
even some full tubes.

Can I get a roller that will do that like the cheapie ring rollers at HF?

Can I make some? I have a BUNCH of rollers that come from those material
handling rolling frames that are around 1.5" OD, and can use one for about
12" materials, and weld a few together for more.

Or I could buy some pipe and make a roller. Does that require two or three
pieces to roll?

Help appreciated.

What's it called?

Sorry I have to ask questions, but I don't know everything.

Yet.

Steve