A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-429-8702
NSN 6610-01-426-5090
NSN 6650-01-140-4463
NSN 4140-00-445-8474
NSN 5855-01-325-9507
NSN 5855-00-832-9341
NSN 5975-01-486-0481
NSN 5915-01-376-7174
NSN 6150-01-371-3435
NSN 5925-01-566-3242
NSN 5915-01-181-5603
NSN 6110-01-564-3365