A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-00-752-0744
NSN 6135-00-405-1989
NSN 6105-00-005-3527
NSN 6650-01-386-1300
NSN 5975-01-651-8632
NSN 6220-01-657-5324
NSN 6110-01-536-5805
NSN 6110-01-500-2005
NSN 6220-01-501-7221
NSN 7035-01-506-0734
NSN 5998-01-120-0215
NSN 6105-00-900-4143