A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-00-832-5747
NSN 6650-01-574-0714
NSN 5965-01-013-0290
NSN 5855-01-082-3693
NSN 5999-01-520-8654
NSN 6645-00-674-9728
NSN 5920-01-258-5035
NSN 6645-00-269-2764
NSN 5835-01-392-3105
NSN 6145-01-318-4774
NSN 6145-01-359-2378
NSN 4140-01-586-9605