The 42PCS Thread Repair Kit is made of high quality hardened carbon steel, moderate hardness, wear resistance, high service life and wide range of applications.It's a professional tool for dealing with the screw cap range.
The 42PCS Thread Repair Kit including 3 thread repair sizes in unc/unf /metric, there are 21pcs rethreading dies,19pcs rethreading taps, 2 sae thread files.