A claw hammer can be said to look roughly like the letter "T" with the handle being the long part, and the head being the line across the top which looks like a "t". One side of the head is flat with either a smooth or textured surface and is used for impacting another surface, such as hammering in a nail. The other side of the head curves down and splits in the middle forming a "V" shape with a thin end. This "claw" is used to pull out nails.
As an improvised weapon, the blunt end can strike with force powerful enough to crush a man's skull. The claw has thin edge gives it more pressure and some piercing ability.