A splitting maul, also referred to as a block buster or sledge axe, is used to split a piece of wood along the grain. One end of the maul looks like a hammer, while the other end looks like an axe. However, unlike an axe, the edge doesn't need to remain sharp to be effective. It's efficacy is based on its ability to wedge between wood grain to split it, instead of the axe's ability to cut across the grain. The hammer end of the maul is used to split larger piece of wood in combination with a splitting wedge.