A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-00-664-4665
NSN 7035-00-371-7749
NSN 5910-00-830-4423
NSN 5996-01-224-7914
NSN 5920-01-501-4345
NSN 4140-01-588-7183
NSN 6110-01-530-2204
NSN 5920-00-908-1929
NSN 6645-00-901-9281
NSN 5960-01-332-9695
NSN 6220-01-459-8668
NSN 5960-01-323-6432