A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-504-2441
NSN 5990-00-074-3056
NSN 5935-01-397-0734
NSN 5895-01-631-8829
NSN 6645-01-359-5769
NSN 6110-01-153-9724
NSN 5895-01-337-4597
NSN 5915-01-290-5847
NSN 6135-01-629-6940
NSN 7035-00-225-6499
NSN 6610-01-431-7840
NSN 6645-01-310-7348