Abstract: A power actuated device for attaching a protective metal strip to the outside corner formed by two intersecting wall panels is provided. The device includes a shoe releasably mounted on the device for holding the device and the protective in alignment along the corner. The shoe is provided in a number of differing shapes, each one of which complements the contour of an associated protective strip. The device further includes attaching means supported on the shoe for attaching the metal strip to the wall, a toggle mechanism for moving the attaching means between an inactive and an attaching position and an electrically powered actuator supported on the shoe and connected to the toggle mechanism to move the attaching means between their inactive and attaching positions.