A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-599-7563
NSN 6240-00-299-9819
NSN 5990-00-254-4825
NSN 5950-01-287-1957
NSN 6610-00-582-1107
NSN 4140-01-170-1075
NSN 5999-01-333-7349
NSN 6610-01-222-0582
NSN 6620-01-494-9858
NSN 6685-00-003-1267
NSN 6620-01-446-6571
NSN 6240-01-195-8696