Iron Towers are the improved form of Wooden Towers. They are twice the cost of wooden towers but are easily more durable. They cost 1400 gold, and have 720 HP. These towers have the capability of withstanding against Magmagrocks and Diggrocks unlike its wooden model. It's repairs cost is 14 for each % HP lost.
"Much more durable compared to the wooden tower."
Iron towers can be used to defend tower locations that are often targeted by Grocks or are crucial to defending/watching a certain area. Such towers are also handy when a mission from Colonel Buster calls for a certain tower to be protected. Iron towers, as stated earlier, can also be used to prevent Magmagrocks and Diggrocks from easily destroying it.