A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-330-8126
NSN 6320-01-418-2611
NSN 5999-01-192-2068
NSN 6610-01-084-3611
NSN 5895-01-258-7713
NSN 5990-01-089-6743
NSN 5985-01-081-8506
NSN 5920-01-531-6213
NSN 5925-01-209-2173
NSN 2925-00-448-4685
NSN 6650-01-126-6238
NSN 5996-01-285-1165