A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-521-0626
NSN 5895-01-119-3942
NSN 6685-01-360-8912
NSN 5935-00-103-7745
NSN 6240-01-447-6857
NSN 5855-00-304-7163
NSN 5925-01-434-6212
NSN 6610-00-680-8325
NSN 6110-00-588-2440
NSN 5855-01-301-0158
NSN 6610-00-113-9176
NSN 5905-01-409-2951