A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-215-0557
NSN 6220-01-590-7142
NSN 5945-01-327-3629
NSN 6620-01-209-1472
NSN 5996-01-455-9188
NSN 5930-00-269-4996
NSN 6105-01-167-0758
NSN 6110-01-263-9437
NSN 5996-00-653-4280
NSN 5996-01-353-8017
NSN 5925-00-578-4774
NSN 5945-00-859-6453