Ozzistraightshooter Tap, Die & Drill set for common barrel muzzle 
thread 5/8 inch x 24 TPI.
 
Precision Intermediate tap made from high speed steel.
Matching 5/8 x 24 Die for barrel threading. Die has outside diameter of 38mm.
 
Hard to find 14.8 mm drill (175 mm long) is included to help make the 
thread precisely.
 
5/8 inch x 24 TPI is a very popular thread used on many Center-Fire rifles.
 
These are top quality tools designed for professional use.