4/2 refers to the 4 primary / 2 secondary affixes that most rare and legendary items roll with in Diablo 3 or Reaper of Souls, with the [[Loot 2.0]] itemization system. The 4/2 system replaced a more randomized system in [[Diablo 3 vanilla]], where affixes were not assigned to [[primary ]] or [[secondary]], and items could roll up to 6 affixes, selected almost entirely at random.

This system gave rare/legendary items in D3v much wider variance, with some complete junk and a tiny percentage coming in with super high quality in the (impossible) equivalent of a Loot 2.0 item with 6 primary affixes.