I often use a vise to hold steel while I cut it to size. It’s normally bolted to a workbench, but I got tired of taking the same picture of the same vise bolted to the same workbench across 40+ articles, so I took it off for a bit of variety. You would bolt this down for this kind of work normally. Steel is cheaper when bought in longer lengths, so my vise saves me money by allowing me to buy steel in longer sizes. vise in picture, hacksaw in picture