A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-067-8915
NSN 6645-00-327-4005
NSN 7035-00-679-9027
NSN 5998-01-586-9993
NSN 6240-00-267-7428
NSN 5999-00-723-2072
NSN 6220-01-370-4215
NSN 5910-01-303-6862
NSN 6685-00-291-4050
NSN 4140-01-364-1104
NSN 5835-01-205-6614
NSN 6135-01-140-8201