The support stand helps you when working with long workpieces, for example wooden boards that you want to trim and which overhang the usual work surface due to the length. Because you can adjust the height, and because the roller offers a broad supporting surface, you can remain flexible.

That depends on the stability and weight of the wood or metal that you want to work on. However, you can use multiple roller stands together when you need to work with especially long beams or similar.