A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-197-0159
NSN 6130-01-509-1551
NSN 6645-00-805-0066
NSN 5960-00-479-0063
NSN 5975-00-202-5013
NSN 6110-01-605-3352
NSN 5945-00-370-3587
NSN 5950-00-111-3430
NSN 6320-00-225-7013
NSN 5998-01-429-0119
NSN 5985-01-616-4478
NSN 5985-01-045-4369