Spalling is also used to describe the flakes of metal chipped off the inside of armor plating on tanks and other AFVs due to attacks on the outside creating a shock wave that travels through the armor and breaks the softer metal on the inside. Spalling is an intended effect of the high explosive squash head anti-tank round and of many other munitions which may not be powerful enough to pierce the armor of a target. This spall is often very damaging and may result in a partial or complete "kill."