Dual Wield Specialisation

From WoW: IncGamers World of Warcraft Wiki

Talent: Dual Wield Specialisation
Effect: Increases the damage done by your offhand weapon by a %.
Statistics: Rank 1 = +5%, Rank 2 = +20%, Rank 3 = +30%, Rank 4 = +40%, Rank 5 = +50%.