A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-381-7560
NSN 6645-01-657-2604
NSN 6685-00-112-7040
NSN 4140-00-960-4310
NSN 6220-01-123-5139
NSN 5835-00-168-4258
NSN 5960-00-335-3394
NSN 5855-01-152-8782
NSN 6130-01-538-9086
NSN 5910-01-033-5247
NSN 6130-01-279-5936
NSN 6620-01-335-2443