Tubing rollers come in many shapes and sizes, so it's vital you choose one that works for the applications you intend to work on the most.
If you're in the market for an economical manual tubing roller, you really should take a look at this Tubing Roller from Pittsburgh tools (SKU: 99736). This model is made for bending mild steel, copper and aluminum tubing alike. You can use it to fabricate an exhaust, roll bars and many other projects.
This Pittsburgh tubing roller is an absolute wonder. It includes 1, 1 1/2 and 2-inch rollers that can bend tubing anywhere from 3/4-inch to 2-inches in diameter. It even supports 3/4-inch, 1 1/4-inch and 2-inch Electrical Metallic Tubing (EMT) conduit sizes. Regardless of your project type, it works incrementally so that you can create bends as precise as necessary.
This tubing roller may be bench mounted as well on this adjustable pedestal stand (sold separately); just make sure your workbench is solid, level and strong enough to support not only the tool itself but your work material and any pressure applied to the tool while performing the bending.
Keep in mind this unit is designed for bending mild steel, copper and aluminum. Never try to bend plastic or PVC pipe with it! Another word of caution: always check your minimum practical bend radius. This depends on the diameter and wall thickness of the tube you are working with. Making bends with too small of a radius will result in tube deformations like flattening, folding or rupturing. As always, practice on a piece of scrap material prior to starting your project.