Missiles of this type have what is called (at least by the US) a continuous rod warhead. This type of warhead is basically several layers of hardened steel rods wrapped in a special configuration. When the explosive charge goes off just imagine a giant buzz saw blade (multiples) flying through the air in close proximity to the target. When the rods expand to maximum diamater they break apart and turn into individual buzz saws. End result the target is shredded.