A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-273-2794
NSN 5975-01-493-7854
NSN 5999-00-959-3912
NSN 5996-01-074-9603
NSN 5996-00-452-2187
NSN 6220-01-516-7088
NSN 2925-00-070-4576
NSN 5965-00-058-1245
NSN 6240-00-066-0714
NSN 5996-00-144-8091
NSN 6130-00-540-5305
NSN 5975-01-602-1540