A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-00-078-2329
NSN 6620-00-203-9466
NSN 6105-00-936-5025
NSN 6130-00-772-8567
NSN 5990-01-016-3006
NSN 5855-01-020-7982
NSN 5945-01-196-6030
NSN 5990-01-382-3244
NSN 6220-01-396-7326
NSN 4140-00-740-2153
NSN 5935-01-080-9249
NSN 4140-00-316-5383