A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-137-1028
NSN 7035-01-199-6915
NSN 6610-00-121-4683
NSN 5855-01-431-8834
NSN 6145-00-366-5790
NSN 6150-00-249-7955
NSN 6240-00-185-8367
NSN 6150-00-159-5271
NSN 6105-00-229-0505
NSN 5920-00-773-1282
NSN 5975-01-115-5897
NSN 5999-00-139-1729