A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-464-5084
NSN 5835-01-085-5487
NSN 6145-01-614-2313
NSN 5999-01-100-8434
NSN 5855-01-357-4335
NSN 6610-01-536-1252
NSN 6610-01-484-8980
NSN 5975-00-433-5983
NSN 5996-00-499-1438
NSN 5895-01-139-0353
NSN 6685-01-276-8200
NSN 4140-01-020-4224