A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-01-308-4130
NSN 6645-01-400-1137
NSN 5999-01-556-7931
NSN 5910-00-924-9849
NSN 2925-01-448-2880
NSN 5935-01-366-0145
NSN 5996-01-653-9570
NSN 5915-00-051-3997
NSN 5975-00-733-5988
NSN 6240-00-280-0186
NSN 7035-00-529-3128
NSN 6685-00-290-0209