Abstract: A hand held Pittsburgh lock opening device is designed to open a longitudinal seam that is used in the fabrication of sheet metal ductwork. The tool has a unitary, longitudinal base having a major plane, an upper surface, and a lower surface. The base tapers from a proximal end to a distal end thereof. A plurality of parallel, longitudinal channels is oriented along the major plane on both upper and lower surfaces of the base. A protrusion is provided at the distal end of the base from its upper surface and extends from the upper surface of the base perpendicularly to the major plane thereof. The protrusion is tapered upwardly to an uppermost end and away from the base. An inverted U-shaped terminus is disposed at the uppermost end of the protrusion and forms a sharp taper for penetrating between coacting duct components.