A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-050-4330
NSN 6620-01-352-1854
NSN 5950-01-131-1724
NSN 5950-00-552-1991
NSN 5998-01-394-5818
NSN 6650-01-177-4398
NSN 2925-01-090-2391
NSN 6145-01-330-5156
NSN 6110-01-427-0161
NSN 5998-01-242-6212
NSN 5999-01-309-9303
NSN 5975-00-647-4968