A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-00-841-8269
NSN 5915-00-478-4204
NSN 5925-00-107-4234
NSN 5975-01-498-9934
NSN 5930-00-996-5456
NSN 5960-01-274-3900
NSN 5855-01-389-3091
NSN 5999-01-201-1730
NSN 5835-01-227-4752
NSN 5915-01-592-3411
NSN 5915-01-370-9762
NSN 5910-01-415-3108