A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-331-6268
NSN 5965-00-393-1294
NSN 6240-00-110-4497
NSN 5915-01-612-1871
NSN 5905-01-571-1305
NSN 6150-01-123-2629
NSN 4140-01-567-7605
NSN 6685-01-284-1602
NSN 6150-01-056-7146
NSN 4140-00-587-7496
NSN 5910-01-641-5532
NSN 5935-00-279-9005