A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-198-9506
NSN 6110-01-337-0223
NSN 6240-01-329-4599
NSN 6130-00-202-4688
NSN 4140-01-549-0975
NSN 5920-01-132-7482
NSN 6650-01-089-7777
NSN 6105-01-630-9813
NSN 6135-00-470-7779
NSN 5990-00-062-9483
NSN 6220-01-416-8487
NSN 7035-00-055-9778