Feature●UNC Master Thread repair system by Time-Sert p/n 0010●This set includes 5 complete thread repair tool kits!●Total of 100 inserts in multiple lengths●Sizes include 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13 thread repair kit●Reliable fast permanent repair thread repair kitDescription Master Thread repair system by Time-Sert Kit includes 5 complete tool kits with total of 100 inserts in multiple lengths Sizes include: 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13