A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-044-1860
NSN 5996-01-442-8751
NSN 5915-01-449-0859
NSN 5855-00-548-4742
NSN 7035-00-628-3471
NSN 6105-01-226-4746
NSN 4140-01-552-7406
NSN 5960-00-714-3386
NSN 6610-01-646-1609
NSN 5998-00-112-1499
NSN 5950-01-067-2214
NSN 6150-01-466-8989