A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-683-7894
NSN 6110-01-105-2132
NSN 5915-00-781-3019
NSN 5975-00-196-0698
NSN 5920-01-425-1780
NSN 5998-01-420-6607
NSN 6320-01-451-0821
NSN 5996-01-290-6926
NSN 5990-01-455-2919
NSN 6650-01-507-9636
NSN 4140-01-279-4311
NSN 5975-01-227-4967