Iron Grenades deals a small amount of AOE fire damage and briefly stuns any enemies in range. They are very popular with PVP players.
Iron Grenades are crafted by Engineers with skill of at least 175.
The schematic to make Iron Grenades is available from expert Engineering Trainers.
Iron Grenades are the weaker of the two crafted Grenades, inflicting 132-218 Fire damage to every hostile entity in its 3 yard target radius, as well as disorienting them for 3 seconds. They're the most frequently used grenades, due to their low cost.
Their PvP popularity is at least partially because they can be used while moving and they are created in stacks of 2 to 4 Grenades per one set of mats.