A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-880-7728
NSN 5998-00-887-6540
NSN 6320-01-335-8336
NSN 6645-01-633-1852
NSN 5996-00-077-1830
NSN 5930-00-999-8695
NSN 5895-01-252-9775
NSN 5930-01-273-2191
NSN 6220-00-157-1589
NSN 6610-01-599-4462
NSN 6135-01-442-7275
NSN 6135-01-445-5546