Includes everything to repair female thread in steel, cast iron and aluminium. Sprung insert coils create a stronger thread than the original metal. Kit includes HSS tap, twist drill, coil driver, tang remover, spare inserts and hex key. Includes everything to repair female thread in steel, cast iron and aluminium. Sprung insert coils create a stronger thread than the original metal. Kit includes HSS tap, twist drill, coil driver, tang remover, spare inserts and hex key.