A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-912-0240
NSN 5996-01-648-0405
NSN 5990-01-605-4769
NSN 5975-01-291-1711
NSN 6240-01-200-7937
NSN 6650-01-033-6667
NSN 5835-01-548-5864
NSN 6220-01-427-2333
NSN 6645-00-300-0401
NSN 5960-01-024-7918
NSN 6130-01-340-4156
NSN 6135-00-351-8606