A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-256-0951
NSN 6135-01-252-0315
NSN 5915-01-237-2480
NSN 5950-01-153-0668
NSN 6685-00-404-3715
NSN 2925-01-203-0493
NSN 5895-01-375-4607
NSN 5855-01-441-3189
NSN 5975-01-559-7940
NSN 5965-00-281-0319
NSN 6105-01-014-9251
NSN 5998-00-923-7303