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Professional tool for commercial or occasional use Ideal for repairing damaged or stripped internal threads Protects tapped threads against wear and damage Creates a stronger internal thread in soft materials Helicoil is a permanent repair to worn and damaged threads. UNC (UNIFIED NATIONAL COARSE) Imperial inserts THREAD SIZE 1/4 inch x 20 (TPI) UNC (Unified national Coarse) SET INCLUDES THE FOLLOWING 10 x 6mm thread length inserts 1 x 6.7mm drill bit 1 x 1/4 inch x 20 thread tap 1 x insert installation 1 x lug breaking tool Comes in a blow molded case for easy storage and transportation