A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-261-4958
NSN 6135-01-422-1440
NSN 5895-01-416-6243
NSN 5998-00-661-0380
NSN 6650-00-690-8709
NSN 6650-01-213-1231
NSN 6110-01-441-1024
NSN 6130-01-027-0762
NSN 5965-00-275-0491
NSN 5895-00-276-7916
NSN 6135-00-577-8429
NSN 6135-01-478-9316