A hammer comprising: a body; a tool holder mounted on the body for holding a cutting tool; a handle, comprising a grip portion, pivotally mounted on the body about an axis of pivot; a first vibration dampener which connects between the handle and the body and which reduces the amount of angular vibrations transmitted from the body to the handle; a motor mounted within the body; a hammer mechanism mounted in the body, capable of being driven by the motor when the motor is activated, the hammer mechanism, when driven, imparting impacts onto a cutting tool when held by the tool holder; wherein at least the grip portion of the handle is also slideably mounted on the body so that the position of the grip portion can be linearly moved relative to the body; and there is further provided a second vibration dampener located between the grip portion and the body which reduces the amount of linear vibrations transmitted from the body to the grip portion.