9/16 inch x 24, Tap & Die set, suits common Muzzle Threads. High speed steel.
Ozzistraightshooter Tap & Die set for common barrel muzzle thread 9/16 inch x 24 TPI.
Precision Intermediate tap made from high speed steel.
Matching 9/16 x 24 Die for barrel threading. Die has outside diameter of 38mm.
9/16 inch x 24 TPI is a popular thread used on 40 cal. firearms, Ruger Rifles and others.
These are top quality tools designed for professional use.