A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-220-5118
NSN 6220-00-772-5176
NSN 4140-01-025-1555
NSN 5965-00-931-8446
NSN 5975-00-136-1254
NSN 5975-01-063-4101
NSN 5945-01-423-2657
NSN 5895-00-148-6419
NSN 6620-01-119-3396
NSN 5905-00-419-0679
NSN 5935-00-945-1722
NSN 6685-01-416-9897