Although visually identical to the auto axe, the steel saw is much weaker, dealing roughly half as much damage. It appears to be a modified concrete cutter or saw, with a rotating metal blade. Slaves use the steel saw for cutting through metal objects. However, this does not translate to an in-game damage bonus against robots.
Auto axe, a modified and stronger version of the steel axe made out of old car parts
Man Opener, a stronger variant of the auto axe that ignores damage resistance.