A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-597-0085
NSN 4140-01-424-4595
NSN 5915-01-273-8922
NSN 4140-01-465-4541
NSN 6685-01-611-5060
NSN 7035-00-205-1932
NSN 5996-00-171-0144
NSN 6135-01-491-9360
NSN 6610-00-641-3015
NSN 5996-00-032-3592
NSN 5920-01-170-5997
NSN 5925-00-275-7599