Bearing Raceway - Locked in by annular groove-trunnion design. Made of fiber reinforced nylon. Spherical Ball - Precision make from selected low carbon steel-case hardened - file hard. Plated plus dichromate treated for corrosion resistance. Outer Member (Housing), Low carbon steel, plated plus dichromate treated for corrosion resistance. Left Hand Thread - Available with left hand thread in most sizes. Marked for easy user identification. Only Available Fully Assembled.