A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-462-5980
NSN 6110-01-654-6383
NSN 5925-00-932-3027
NSN 6130-00-435-4738
NSN 5990-01-056-6413
NSN 5905-00-922-0418
NSN 6645-01-118-2058
NSN 6150-00-233-0820
NSN 5855-00-797-8217
NSN 5905-01-660-8559
NSN 6620-00-815-0124
NSN 6130-00-822-4903