A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-00-357-3043
NSN 6220-00-900-7595
NSN 6685-00-038-7886
NSN 6610-00-734-5976
NSN 5835-00-301-3812
NSN 6650-01-541-4357
NSN 7035-00-104-7613
NSN 5998-01-032-4391
NSN 5975-01-515-5535
NSN 5855-01-257-2636
NSN 6320-01-088-1109
NSN 5835-01-079-9533