Metal brake attachment, to be used with my 12 ton press. I did a couple quick trials on 1/8" mild steel, and it works well. The specs that say it will handle up to 3/8" steel may be a bit optimistic, but for most brackets, looks like it will work well. I caught a free shipping plus discount deal that I couldn't pass up. My bench vice will appreciate not taking a beating to bend heavier metal.