A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-443-5291
NSN 5975-00-117-9515
NSN 5960-00-902-0942
NSN 5935-00-891-8482
NSN 6320-01-319-3584
NSN 6610-01-571-8038
NSN 5925-01-536-3440
NSN 6220-01-441-2249
NSN 5895-01-512-5533
NSN 6135-01-357-0621
NSN 6145-01-602-2630
NSN 5935-00-285-2767