A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-524-0035
NSN 5895-00-305-2307
NSN 5905-01-196-7115
NSN 5835-01-370-4292
NSN 6620-00-446-8048
NSN 5910-00-184-8249
NSN 5945-01-566-0471
NSN 5835-00-378-1429
NSN 6685-00-175-9382
NSN 5855-01-511-0995
NSN 5990-01-107-1003
NSN 6650-00-477-4538