A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-949-5985
NSN 5905-00-081-8913
NSN 6240-01-529-6375
NSN 6685-01-065-3511
NSN 5998-01-321-8473
NSN 5985-00-144-6385
NSN 5855-01-422-8782
NSN 5925-01-447-2968
NSN 5960-01-624-1170
NSN 5925-01-577-9788
NSN 5998-01-384-3842
NSN 6320-01-322-8340