Fixed at 90 degree, clamps miter or butt joints; holds work up to 3" wide and leaves joints fully exposed for miter correction, doweling, gluing or nailing; two countersunk holes permit the clamp to be benchtop mounted; four clamps mounted as such provide a rectangular clamping fixture of unlimited size; frame and sliding jaws are die cast aluminum; screws are plated, cold-drawn steel with smoothly rolled threads; steel sliding-pin handles.