A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-00-144-8471
NSN 6650-01-109-3251
NSN 5935-01-606-2379
NSN 5945-01-494-1428
NSN 5915-00-274-2282
NSN 5915-01-208-3924
NSN 5895-01-462-1911
NSN 5965-01-319-5363
NSN 6610-01-579-0134
NSN 5905-00-324-3043
NSN 5895-01-047-7379
NSN 5920-01-067-4897