A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-00-103-1196
NSN 5998-01-365-8990
NSN 6650-01-422-1037
NSN 6105-00-472-0016
NSN 6620-01-229-7381
NSN 4140-00-248-6089
NSN 4140-01-152-2672
NSN 5990-00-422-2093
NSN 5925-01-560-0155
NSN 5985-01-168-8546
NSN 6150-01-400-1297
NSN 6610-01-346-8241