A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 7035-01-110-5745
NSN 6105-00-936-6675
NSN 6645-00-991-0877
NSN 5950-01-483-9460
NSN 6650-01-172-9476
NSN 5920-00-362-1376
NSN 6130-01-058-3766
NSN 5965-01-073-1014
NSN 5930-01-574-5232
NSN 6240-01-446-3173
NSN 5945-01-123-9006
NSN 6150-01-254-2764