Abstract: A carpentry tool. The tool has a plurality of laterally spaced spike members that are driven into a sole plate or header to anchor the tool at a preselected location thereon where it is desired to position an upstanding stud of the type used in wall construction. A nail-guiding bore means is collectively defined by separate, axially aligned, bores formed in a horizontal flange that is hammered to seat such spikes and in a vertical plate that abuts the stud being installed. The tool is positioned transverse to the sole plate or header, its flange is hammered to seat the spikes, and nails are driven as required on the side of the stud opposite the tool, which tool prevents displacement of the stud during such nailing procedure. A nail is then introduced through the bore defined by the tool and seated to complete the installation, the tool being left in place to further enhance the quality of the construction.