A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-711-0377
NSN 5998-01-532-3577
NSN 5950-00-706-9503
NSN 6620-00-820-9616
NSN 5895-01-442-4102
NSN 5910-01-168-1108
NSN 5975-00-652-8900
NSN 2925-01-068-3844
NSN 5945-00-880-0223
NSN 5945-00-035-9251
NSN 5930-00-796-7192
NSN 6105-00-569-4768