A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-469-5865
NSN 5996-01-129-6422
NSN 5990-00-004-4158
NSN 5920-01-010-4855
NSN 2925-00-265-7539
NSN 6110-00-060-5391
NSN 6610-01-032-2890
NSN 5985-01-410-7784
NSN 6320-01-094-2634
NSN 5915-01-245-3403
NSN 5910-01-258-4887
NSN 5998-00-613-4121