OTC Standard Thread Die Set for Universal Outside Thread Chaser Set includes 6 dies with multiple thread sizes per die Includes the following: 4, 5, 6, 7, 7-1/2, 8, 9, 10, 11, 11-1/2, 12, 14, 16, 18, 20, and 24 threads per inch Sizes clearly stamped on the head faces for easy identification Strong cutting surface ensures cleanly trued threads and a long service life