A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-316-8202
NSN 5910-01-350-3639
NSN 5910-00-677-0937
NSN 5925-00-543-8002
NSN 5905-00-866-4813
NSN 5920-01-500-1880
NSN 6620-00-366-1365
NSN 5855-00-904-9572
NSN 5895-00-050-0785
NSN 6685-00-752-1868
NSN 5960-00-335-3394
NSN 6240-01-351-3747