A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-00-788-0043
NSN 6610-00-278-7647
NSN 6645-01-616-8996
NSN 2925-01-347-9346
NSN 5998-01-247-4593
NSN 6610-01-568-7028
NSN 5960-00-766-6042
NSN 5965-01-089-8579
NSN 5960-00-470-5079
NSN 6145-00-466-4068
NSN 5975-01-371-2087
NSN 5835-01-501-0526