Set rivet nut studs in sheet metal to mount nearly anything on; Works like a rivet nut but instead of female threads offers a male threaded stud you can hang from and tighten down attachments on; Sets the following sizes and includes 5pc each 5/8" long threaded rivet studs: M5, M6, M8, 10-24, 1/4-20 & 5/16-18