• Insanity's Grip
• Item Level 232Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Fist Weapon
• Main Hand
  
• Speed 2.60
• 372 - 558 Damage
• (178.9 damage per second)
• +52 Agility
  +51 Stamina
• Durability 75 / 75
• Requires Level 80
• Equip: Improves critical strike rating by 34.
  Equip: Increases your expertise rating by 25.
  Equip: Increases attack power by 80.
• 
• Sell Price: 22 75 98

Source

This item can be found inside Cache of Innovation after defeating Mimiron in the 25-man version of Ulduar.

Patch changes

• Patch 3.1.0 (14-Apr-2009): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB