High-carbon steel set with 1" solid round dies. Contains one each plug tap and dies for 17 sizes: 4-40NC, 6-32NC, 8-32NC, 10-24NC, 10-32NF, 12-24NC, 1/4-20NC. 1/4-28NF, 5/16-18NC, 5/16-24NF, 3/8-16 NC, 3/8-24 NF, 7/16-14NC, 7/16-20NF, 1/2-13NC, 1/2-20NF, 1/8-27NPT, plus five threading tools. Case with removable tray.