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. British Standard Fine inserts THREAD SIZE 3/8 x 20 (TPI) BSF SET INCLUDES THE FOLLOWING 10 x 9mm thread length inserts 1 x 9.8mm drill bit 1 x 3/8 x 20 thread tap 1 x insert installation 1 x lug breaking tool Comes in a blow molded case for easy storage and transportation