A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-214-2561
NSN 6110-01-188-8017
NSN 5895-00-177-3610
NSN 6650-01-451-1372
NSN 5945-00-113-0472
NSN 6150-00-800-1059
NSN 6110-00-346-7958
NSN 6240-01-604-9172
NSN 6220-01-423-1476
NSN 6110-00-934-7943
NSN 6110-01-288-7996
NSN 5999-01-524-0312