A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-499-6293
NSN 7035-01-029-7221
NSN 5835-01-388-5198
NSN 4140-01-327-3241
NSN 2925-00-295-4765
NSN 5915-01-411-3544
NSN 5975-01-546-8966
NSN 6220-01-425-0876
NSN 5999-01-548-1280
NSN 5975-00-904-6348
NSN 5998-00-728-3637
NSN 6145-00-966-2377