A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-138-8104
NSN 5950-01-578-4800
NSN 6130-01-290-0992
NSN 5920-01-053-0987
NSN 6240-00-501-7964
NSN 5915-01-054-3109
NSN 6610-01-398-2554
NSN 5950-01-313-3918
NSN 6130-01-551-3100
NSN 6130-01-544-5687
NSN 5975-00-008-7834
NSN 6650-01-536-3977