A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-00-044-4615
NSN 6620-01-575-9561
NSN 5935-00-930-4321
NSN 5895-01-418-0850
NSN 5905-01-088-0258
NSN 5985-00-941-5206
NSN 5905-01-086-2751
NSN 6110-01-653-6139
NSN 6130-01-447-2797
NSN 5935-01-081-0955
NSN 6130-01-147-5594
NSN 5920-01-057-4990