8" Black Oxide Cast Iron Monster Square
Love the robustness and practicality. Once you set your parts with clamps against the square (very straightforward), there is no doubt they’re square and will stay there. Anyone assembling square tube frames should get a pair. They will improve your productivity and accuracy (or for the amateur greatly improve your satisfaction of a job well done). And these pieces of kit will last a very long time. Well done, Fireball tools!