Hammers

 Hammer, a tool for hitting or hitting repeatedly. Different applications require multiple designs and weights. A hand hammer consists of a handle and a hitting head, the head is often made of metal with a hole in the middle to accept a wooden grip. Sometimes the whole hammer is forged or cast into a single piece of metal. The surfaces of the hammer heads differ in size, angle of orientation to the handle (parallel or oblique) and face shape (flat or convex). Carpenter's hammers often have nails in their heads for pulling nails out. The weight varies from a few ounces or grams to 15 kilograms (7 kg) for a hammer used to break rock. Heavier hammers are power tools, with pilots among the largest. Trigger hammers rely on gravity for their momentum, but steam hammers often use downward pressure from a steam-activated piston in addition to gravity. Pneumatic air hammers include impact drills for rock and concrete, where the hammer head is the drill head, and riveting hammers, which are...