The Marson rivet-nut kit contains the 39300 thread-setter tool in a plastic case with 8-32, 10-24 10-32 and 1/4-20 mandrels and nosepieces, wrench and instructions. The kit contains assorted ribbed style rivet-nuts; 12 ea. 8-32, 10-24, 10-32; 8ea. 1/4-20 .027-.165 and 6 ea. 1/4-20 .165-.260.