Abstract: A puncher head for punching an intended hole larger than a guide hole through a work piece, said puncher head having a punch and a die fitting thereto, and comprising a centering mechanism to guide the center of the draw-back shaft to the center of the guide hole. The puncher can cut out the intended hole exactly in an intended position.

Abstract: The punching tool of the subject invention has a handle and a hand grip which can be rotated to any position convenient for use, so that the punching operation can be performed easily, irrespective of the shape of the object being treated. The manual hydraulic pump of the tool is connected for rotation to one end of a tubular connector, while the other end of this tubular connector is connected to a hydraulic cylinder in such a manner that the tubular connector can be turned about an axis perpendicular to the axis of the hydraulic cylinder.