Rogue · Combat · tier 4 · from level 25 · needs 3 points in Precision
Dual Wield Specialization
+8.9 Attack
5/5 · level 60 · per cast
Dual Wield Specialization
Rank 5/5
Increases the damage done by your off-hand weapon by 25%.
Averages, counting crits and misses, for a level 60 Rogue with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.