A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-214-0516
NSN 5998-01-011-6969
NSN 6150-01-075-9564
NSN 4140-01-386-5630
NSN 6685-00-403-1226
NSN 6645-00-474-5689
NSN 5855-01-122-9418
NSN 5999-01-240-7352
NSN 5999-00-679-9026
NSN 6105-01-450-0755
NSN 6320-01-357-3222
NSN 5835-01-481-4204