A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-00-056-8600
NSN 5895-00-149-1830
NSN 5998-00-613-9172
NSN 5895-01-461-8287
NSN 5895-01-476-4132
NSN 5945-01-605-5483
NSN 7035-01-123-8723
NSN 5905-01-343-0828
NSN 5835-01-532-9373
NSN 6135-00-112-8637
NSN 5960-00-165-3038
NSN 5930-00-513-1151