I found this in the tool section of a discount store, among the blister packs of carton cutters and soon-to-be-rusty socket sets. It's a tool for cutting small pieces of pipe. I have used it on brass and styrene, and it works very well, considering that it cost all of two Australian dollars. I have cut lengths of brass pipe of approximately 5mm and 6mm diameter, and styrene tube up to about 13mm diameter.
It works by a circular blade (not very sharp itself) which freely rotates and is gradually screwed down over two steel rollers. The pipe is turned by hand on the rollers, as the blade scores and then cuts into the pipe. I have found that the brass tube does bend in slightly at the cut, so if you have bought two thickness of tube to slide into each other - for instance as pistons or gun barrels - you will have to file back the cut end so that the smaller tube can fit inside the larger. Also, when working with large but thin styrene tubes, the plastic can warm slightly in your hands. This means that the cutter will crush rather than slice through the plastic. I recommend going slowly. Again, the blade will score as you turn the tube, which means you can eventually snap the cut portion off. The end may be a tiny bit rough with a cheap tool like this, but sanding or filing will fix that.
Ork Flakka Trakk turret, with gun barrels made from sections of brass pipe.
I have been able to cut sections of pipe down to only a couple of millimeters length - basically brass rings. This tool is an incredibly cheap way to cut tubes for converting models: gun barrels, roll cages, suspension parts, pistons, rings and even 'brass' shells from fired ammunition.
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