A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-00-603-0727
NSN 6130-01-449-1178
NSN 5910-01-417-9806
NSN 5975-00-443-5625
NSN 5975-01-440-9989
NSN 5905-00-218-1237
NSN 5935-01-475-2139
NSN 6685-00-254-6610
NSN 5999-01-220-1628
NSN 6240-00-138-3082
NSN 5835-01-222-2437
NSN 6135-00-080-9176