A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-209-2410
NSN 5990-01-282-4617
NSN 5855-00-548-4742
NSN 6150-01-126-0022
NSN 5950-01-149-2533
NSN 5945-00-466-2887
NSN 7035-00-406-0568
NSN 5965-00-208-4896
NSN 5998-01-655-3399
NSN 5996-01-299-7792
NSN 5945-01-610-8557
NSN 6135-00-880-1026