A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-646-3039
NSN 5975-01-083-0682
NSN 6645-01-322-8431
NSN 6320-01-547-2743
NSN 5996-01-061-2775
NSN 5935-00-446-8768
NSN 5990-01-533-1347
NSN 6620-00-273-8735
NSN 7035-01-074-7634
NSN 5998-01-262-6096
NSN 5895-01-138-2236
NSN 4140-01-304-4789