A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-139-3604
NSN 2925-00-922-8953
NSN 6240-00-688-6351
NSN 6240-00-765-0891
NSN 5935-01-306-4644
NSN 6320-01-630-7629
NSN 5905-00-156-2982
NSN 5935-01-250-5433
NSN 6145-00-871-9112
NSN 5855-01-088-8700
NSN 6610-01-422-9508
NSN 5998-01-193-8509