A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-347-0201
NSN 6320-01-567-9792
NSN 5855-00-014-5008
NSN 6650-01-411-6292
NSN 5985-00-577-2920
NSN 7035-01-162-7452
NSN 5930-01-304-9929
NSN 6620-01-095-5558
NSN 6130-00-905-8701
NSN 5935-00-910-2430
NSN 5920-01-354-6243
NSN 5855-00-149-0766