A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-01-237-2501
NSN 6650-01-537-5388
NSN 5998-01-491-0446
NSN 5975-00-778-6336
NSN 5996-00-508-0383
NSN 5985-00-417-6302
NSN 6685-00-587-8158
NSN 5835-01-330-8597
NSN 6610-00-437-5681
NSN 5895-00-290-6501
NSN 7035-00-232-4043
NSN 5910-00-260-3753