Can you bolt in a roll cage? (video)
What metal is used for roll cages?
There are two grades of steel that are accepted by the authorities as 'roll cage standard' materials. These are CDS or Cold Drawn Steel and T45. Which type of material you choose depends on several options. The first is strength, the second is weight, and the third is cost or budget. via
How do you make your own roll cage? (video)