A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-335-9825
NSN 5945-01-153-0268
NSN 5910-01-157-0887
NSN 6645-01-360-0293
NSN 6685-01-655-8258
NSN 5965-00-722-7574
NSN 5895-00-920-2683
NSN 6240-01-576-9580
NSN 5990-01-581-5103
NSN 6130-00-282-8401
NSN 6240-01-468-5337
NSN 6130-00-787-9976