A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-611-1961
NSN 6610-00-983-4482
NSN 5935-00-728-1786
NSN 2925-00-684-7708
NSN 6130-01-144-0862
NSN 5895-01-108-0461
NSN 6145-01-499-1569
NSN 5985-00-881-9514
NSN 5920-00-988-5057
NSN 5935-01-552-7645
NSN 6220-01-526-5854
NSN 5996-01-055-8608