A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-598-9946
NSN 6650-00-848-9892
NSN 5905-00-097-9536
NSN 5905-01-078-2897
NSN 5915-01-538-0384
NSN 5965-01-252-8701
NSN 5945-00-951-9880
NSN 5920-00-072-1492
NSN 5930-00-688-5227
NSN 5960-00-087-3086
NSN 5950-01-239-0566
NSN 4140-00-987-7532