Manufactured from mild steel, Allied' s Rigid Conduit is highly -resistant to damage from impact yet ductile to facilitate bending. The 3/4 in taper NPT threads (ANSI B1.20.1) are full cut and hot galvanized after cutting. Color coded end cap thread protectors keep the threads clean, sharp and also provide instant trade size recognition. Even sizes are color coded blue, 1/2 sizes black and 1/4 sizes red.