A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-495-0350
NSN 6320-01-643-0850
NSN 6110-01-489-5482
NSN 6620-01-333-7014
NSN 7035-01-544-6671
NSN 4140-01-653-7856
NSN 4140-01-373-1788
NSN 5998-00-172-7619
NSN 6220-01-344-8318
NSN 5985-01-409-2865
NSN 6320-01-088-1109
NSN 5895-00-050-1541