A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-177-4002
NSN 5965-01-461-4603
NSN 6110-00-248-7475
NSN 5855-01-245-8689
NSN 5985-01-331-1647
NSN 6685-00-167-3801
NSN 6135-01-458-3851
NSN 5975-00-223-5191
NSN 6645-01-185-7684
NSN 6650-01-499-5673
NSN 5985-01-231-9272
NSN 6685-01-254-8616