A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-414-7099
NSN 6110-01-245-8995
NSN 5996-01-440-9660
NSN 6240-00-023-9238
NSN 5835-00-284-0882
NSN 5950-01-257-5956
NSN 6240-00-422-1278
NSN 5985-00-818-5487
NSN 5996-01-044-6958
NSN 6650-01-073-9520
NSN 6685-01-015-2126
NSN 5960-01-298-4143