A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-605-0497
NSN 6240-00-820-1705
NSN 5935-01-464-9770
NSN 6145-01-298-3151
NSN 5965-01-448-0018
NSN 5985-01-448-7787
NSN 6130-00-923-3383
NSN 6145-01-272-3365
NSN 2925-01-465-3437
NSN 4140-01-619-5775
NSN 6320-01-386-7396
NSN 6650-00-518-6318