A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-396-6976
NSN 5905-00-779-6005
NSN 5915-01-139-3604
NSN 5990-00-945-3518
NSN 6650-00-852-2736
NSN 6685-01-176-4594
NSN 5930-01-083-9975
NSN 5945-01-305-3776
NSN 5925-01-327-2731
NSN 6620-00-398-0320
NSN 5910-00-144-4383
NSN 6610-01-212-9817