A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-170-5296
NSN 6110-00-097-1053
NSN 5975-00-579-5024
NSN 5925-00-529-0441
NSN 2925-00-964-7128
NSN 5935-01-095-0041
NSN 6685-01-212-5877
NSN 6130-00-522-0334
NSN 5975-01-276-5228
NSN 7035-00-003-7518
NSN 5990-01-254-3197
NSN 7035-01-187-6002