Iron Knuckles

The Iron Knuckles is a one-handed Fist weapon. The Chance on Hit makes it an effective PvP dual wield weapon for Warriors and Rogues.

Source
Iron Knuckles drops from Bruegal Ironknuckle in Stormwind Stockade. Bruegal is a rare mob, which means he is not always in the instance.

Background
This pair of half-gauntlets is designed to wrap around the wearer's knuckles, forcing the fingers to be partially bent or clenched into fists at all times. When used as part of an unarmed attack, iron knuckles significantly increase the owner's combat power.