Professional Metric Hand Nut Rivet Gun w/ 40 nut inserts M3, M4, M5 & M6 Ideal for materials that can't be tapped or welded Includes 40 aluminum nut inserts with tool, ten pieces of each M3, M4, M5, and M6 One hand operation May be used as a blind fastener or screw anchor as well Nut is suitable for small production applications or mass production assembly lines.