 The weak, smaller diameter HEAT precursor charge pushes through the ERA without setting it off, and punches a channel through it for the much larger diameter HEAT warhead, which then penetrates the target's primary armor.A two-layered molybdenum liner is used for the precursor and a copper liner for the main warhead.To protect the main charge from the explosive blast, shock, and debris caused by the impact of the missile's nose and the detonation of the precursor charge, a blast shield is used between the two charges.