Their immense weight and density can also help them be innately hammer-proofhammer-proof without the need for any sort of special armor. In fact, the metal men would probably not need any armor or weapons. They could easily sharpen their arms into blades and charge into battle arm flailing. No weapon of steel would be able to deal with them easily, and their flailing blade arms would actually be capable of chopping through enemy weapons and armor. One thing to note is that they weigh 1.6 tons, and a human arm is roughly 1/6 the total body weight, so that would be a 260kg blade arm swinging about.