A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-00-518-1477
NSN 6145-01-386-3940
NSN 6110-01-104-4777
NSN 5960-01-495-0859
NSN 5996-01-430-3960
NSN 5950-00-824-2120
NSN 5998-01-545-6617
NSN 6135-01-359-5798
NSN 2925-00-115-5857
NSN 5855-01-481-3906
NSN 5945-00-753-7716
NSN 7035-00-455-7666