Abstract: An improved fastener driving tool having particular utility at locations that are otherwise inaccessible is disclosed. The fastener driving tool of this invention includes an elongated cylinder having one closed end. A ram is slidably mounted in the cylinder so that one end of the ram bears against the inside surface of the closed end of the cylinder. An axially displaceable rod is mounted on the outside surface of the cylinder and includes a clip that is adapted to hold the head of the nail against the outside surface of the closed end of the cylinder. With the nail so positioned the tool may be inserted behind a wall, for example through a pre-existing window opening, so that a header may be secured to a stud. By using the tool of the present invention, it is not necessary to remove any plaster or wallboard in order to expose the header and studs that are to be nailed. The ram is moved axially in two opposite directions within the cylinder until the nail is sufficiently started.