A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-201-4914
NSN 6240-01-575-0067
NSN 5960-01-266-1011
NSN 6650-00-857-2260
NSN 5925-01-141-6688
NSN 5996-01-045-7004
NSN 5965-00-661-0469
NSN 5965-00-144-2543
NSN 6610-01-400-3880
NSN 6610-00-225-9886
NSN 6650-01-340-1459
NSN 5999-00-444-7910