Model 39313 Aluminum Threaded Insert Kit contains the 39300 thread-setter tool in a molded plastic case with 6-32, 8-32, 10-24, 10-32, 1/4-20, 5/16-18 and 3/8-16 mandrels and nosepieces, wrench and instructions. The kit contains 62 assorted AluminumThread Inserts: 10 each 6-32, 8-32, 10-24, 10-32, 1/4-20, and 6 each of 5/16-18, and 3/8-16.