A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-227-0660
NSN 6150-01-586-5912
NSN 5945-01-058-5695
NSN 5855-01-247-0012
NSN 5945-01-102-0584
NSN 5920-01-177-6352
NSN 5930-00-089-4605
NSN 5920-01-386-3188
NSN 6610-00-377-7956
NSN 5960-00-359-7768
NSN 5996-00-753-1599
NSN 6135-00-152-8729