A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-01-579-7695
NSN 5930-01-196-5839
NSN 6220-00-617-9616
NSN 6105-01-058-5716
NSN 5920-00-373-3636
NSN 5999-01-401-5322
NSN 6645-01-437-4860
NSN 6650-01-063-9655
NSN 6240-01-463-8276
NSN 5910-00-709-3233
NSN 6105-01-333-9162
NSN 6240-00-212-4305