A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-00-019-6464
NSN 6685-00-198-9506
NSN 6610-01-034-5226
NSN 5905-01-191-3941
NSN 5996-00-683-5176
NSN 6650-01-601-1618
NSN 5935-00-451-6758
NSN 5999-01-246-1517
NSN 6130-01-227-5538
NSN 6240-01-015-8880
NSN 5855-01-566-8574
NSN 5930-01-549-8341