A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-424-0542
NSN 5930-01-451-7859
NSN 5945-01-494-8272
NSN 5935-01-216-7619
NSN 6145-00-873-4808
NSN 5975-00-244-0706
NSN 5935-01-461-8096
NSN 6145-00-255-7696
NSN 5996-01-234-1138
NSN 6610-00-264-0961
NSN 6130-00-159-1104
NSN 6135-01-100-3593