Hammers are among the most common hand tools. The hammer head helps to deliver a sudden impact to an object, which could otherwise not be carried out in this powerful and concentrated form by human hand. There are different types of hammers available, varying in shape, size and structure (i.e. metal or plastic), depending on the working area. Vibration dampening hammers can be used frequently with little return shock. Hammers are used in many fields of work, including the assembly of electrical equipment.