A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-619-7769
NSN 5930-00-683-2923
NSN 5998-01-237-6097
NSN 7035-01-559-8821
NSN 5945-00-723-2825
NSN 6105-01-634-0322
NSN 5950-01-658-5757
NSN 5905-00-553-9985
NSN 5915-01-633-9845
NSN 5910-00-288-5979
NSN 5996-01-556-3448
NSN 5950-01-028-4105