Claw hammer is used for pounding nails into or extracting nails from other objects. Generally, a claw hammer is related with wood working but is not limited to use with wood products. It is not suitable for heavy hammering on metal surfaces as the steel of its head is somewhat brittle. The hammer weight ranges from 1lbs, 2lbs, 3lbs, 4lbs and above and the material used for this hammer are wood, steel, rubber, brass, stone and so on. It is used to lever up floorboards, remove nails and so on.