A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-00-400-5265
NSN 5960-00-133-2475
NSN 5990-01-065-0492
NSN 6135-01-322-4655
NSN 5998-00-167-4981
NSN 6130-01-407-3272
NSN 6135-01-483-1501
NSN 4140-01-223-2516
NSN 6685-01-596-8716
NSN 7035-01-125-7357
NSN 6320-01-506-9439
NSN 5975-00-891-9738